mirror of https://github.com/therootcompany/tz.js
6 changed files with 515 additions and 173 deletions
@ -1,3 +1,214 @@ |
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# when.js |
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# xtz.js |
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|
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Something about timezones and JavaScript |
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A fast, lightweight, zero-dependency library to |
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translate between Time Zones and UTC with native |
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`Intl.DateTimeFormat` in ~100 LoC. For Node.js & Browsers. |
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|
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XTZ is a poor man's Temporal polyfill, but just for time zones. |
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|
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> What UTC time will it be when it's 3:15am in New York? |
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```js |
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// Relative New York time to Absolute UTC Time |
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TZ.toUTCISOString("2021-11-07 03:15:59.000", "America/New_York"); |
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// "2021-11-07T03:15:59.000-0500" |
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``` |
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|
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```js |
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var tzDate = TZ.toUTC("2021-11-07 03:15:59.000", "America/New_York"); |
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// { |
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// year: 2021, month: 11, day: 7, |
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// hour: 3, minute: 15, second: 59, millisecond: 0, |
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// offset: -300, timeZoneName: "Eastern Standard Time" |
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// } |
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tzDate.toISOString(); |
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// "2021-11-07T03:15:59.000-0500" |
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// same as "2021-11-07T08:15:59.000Z" |
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``` |
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|
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> What time will it be in New York when it's 7:15am UTC? |
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|
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```js |
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// Absolute UTC time to Relative New York time |
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TZ.toTimeZoneISOString("2021-11-07T07:15:59.000Z", "America/New_York"); |
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// "2021-11-07T03:15:59.000-0400" |
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``` |
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|
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```js |
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var utcDate = TZ.toTimeZone("2021-03-14T07:15:59.000Z", "America/New_York"); |
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// { |
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// year: 2021, month: 11, day: 7, |
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// hour: 3, minute: 15, second: 59, millisecond: 0, |
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// offset: -240, timeZoneName: "Eastern Daylight Time" |
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// } |
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|
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utcDate.toISOString(); |
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// "2021-03-14T03:15:59.000-0400" |
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// same as "2021-11-07T07:15:59.000Z" |
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``` |
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|
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# Features |
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- [x] Translate a UTC time to a Time Zone |
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- [x] Translate a Zoned time to UTC |
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- [x] Handles **Daylight Savings**, Weird Time Zones, etc... |
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- [x] Lightweight (No deps) |
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- 5kb Source + Comments |
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- 2.5kb Minified |
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- <1kb `gzip`d |
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|
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Compatible with Node.js & Browsers. |
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|
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## Node.js & Webpack |
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```bash |
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npm install --save xtz |
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``` |
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```js |
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var TZ = require("xtz"); |
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``` |
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## Browsers |
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```html |
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<script src="./xtz.js"></script> |
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``` |
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|
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```js |
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var TZ = window.XTZ; |
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``` |
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# API |
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- `toTimeZone(utcDate, timeZone)` |
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- `toTimeZoneISOString(isoString, timeZone)` |
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- `toUTC(dtString, timeZone)` |
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- `toUTCISOString(dtString, timeZone)` |
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|
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## `toTimeZone(utcDate, timeZone)` |
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> Convert UTC into a Target Time Zone |
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Use ISO timestamps representing the absolute UTC time in the target time zone: |
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```txt |
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"2021-11-07T08:15:59.000Z" |
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``` |
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Convert directly to an ISO String: |
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```js |
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TZ.toTimeZoneISOString("2021-11-07T08:15:59.000Z", "America/New_York"); |
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// "2021-11-07T03:15:59.000-0500" |
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``` |
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Or use our bespoke (custom) date object: |
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```js |
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var tzDate = TZ.toTimeZone("2021-11-07T08:15:59.000Z", "America/New_York"); |
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``` |
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You can also use a date object with an absolute UTC time: |
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```js |
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var tzDate = TZ.toTimeZone( |
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new Date("2021-11-07T08:15:59.000Z"), |
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"America/New_York" |
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); |
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``` |
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```js |
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console.log(tzDate.toISOString()); |
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// "2021-11-07T03:15:59.000-0500" |
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``` |
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Our ISO Strings + Offsets work with JavaScript's native Date object!! |
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```js |
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new Date("2021-11-07T03:15:59.000-0500").toISOString()); |
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// "2021-11-07T08:15:59.000Z" |
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``` |
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## `toUTC(dtString, timeZone)` |
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> Convert a Target Time Zone into UTC |
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Use ISO-like timestamps representing the _local_ time in the target time zone: |
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```txt |
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"2021-11-0 T03:15:59.000" |
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``` |
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Convert directly to an offset ISO String: |
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```js |
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TZ.toUTCISOString("2021-11-07 03:15:59.000", "America/New_York"); |
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// "2021-11-07T03:15:59.000-0500" |
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``` |
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Or our bespoke date object: |
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```js |
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var utcDate = TZ.toUTC("2021-11-07 03:15:59.000", "America/New_York"); |
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``` |
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You can also use a date object as the source time, but the date's UTC time will be treated as **_relative to time zone_** rather than absolute (this is a workaround for JavaScript's lack of bi-directional timezone support). |
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```js |
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var utcDate = TZ.toUTC( |
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new Date("2021-11-07T03:15:59.000Z"), |
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"America/New_York" |
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); |
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``` |
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```js |
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utcDate.toISOString(); |
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// "2021-11-07T03:15:59.000-0500" |
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``` |
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# Daylight Savings / Edge Cases |
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> In 2021 Daylight Savings (in the US) |
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> |
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> - begins at 2am on March 14th |
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> - ends at 2am on November 7th |
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> |
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> See <https://www.timeanddate.com/time/change/usa>. |
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Q: What happens in March when 2am is skipped? |
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- A: Although 2am is not a valid time, rather than throwing an error this library will resolve to 1am instead, which is an hour early in real ("tick-tock" or "monotonic") time. |
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```js |
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var utcDate = TZ.toUTC("2021-03-14 02:15:59.000", "America/New_York"); |
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utcDate.toISOString(); |
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// "2021-03-14T02:15:59.000-0400" |
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// (same as "2021-03-14T01:15:59.000-0500") |
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``` |
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Q: What happens in November when 2am happens twice? |
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- A: Although both 2ams are distinguishable with ISO offset times, only the first can be resolved from a local time with this library. |
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```js |
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var utcDate = TZ.toUTC("2021-11-07 01:15:59.000", "America/New_York"); |
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utcDate.toISOString(); |
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// "2021-11-07T01:15:59.000-0400", same as "2021-11-07T05:15:59.000Z" |
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// (an hour before the 2nd 2am at "2021-11-07T01:15:59.000-0500") |
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``` |
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# List of Time Zones |
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See the [Full List of Time Zones](https://en.wikipedia.org/wiki/List_of_tz_database_time_zones) on Wikipedia. |
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Common Zones for Testing: |
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```txt |
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America/New_York -0500 |
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America/Denver -0700 |
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America/Phoenix -0700 (No DST) |
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America/Los_Angeles -0800 |
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Australia/Adelaide +0930 (30-min, has DST) |
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Asia/Kathmandu +0545 (No DST, 45-min) |
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Asia/Kolkata +0530 (No DST, 30-min) |
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``` |
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@ -0,0 +1,89 @@ |
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var XTZ; |
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(function () { |
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"use strict"; |
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if (!XTZ) { |
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try { |
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XTZ = require("xtz"); |
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} catch (e) { |
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XTZ = require("./xtz.js"); |
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} |
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} |
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var TZ = XTZ; |
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var tzDate; |
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//
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// UTC-absolute time translated to a Time Zone
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//
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function demo1() { |
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console.info("What's the UTC equivalent of 8:15am in New York?"); |
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console.info(); |
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console.info("\t// during daylight savings"); |
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console.info( |
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`\tXTZ.toUTC("2021-03-14 08:15:59.000", "America/New_York")` |
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); |
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console.info(`\ttzDate.toISOString()`); |
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tzDate = XTZ.toUTC("2021-03-14 08:15:59.000", "America/New_York"); |
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console.info( |
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"\t" + tzDate.toISOString(), |
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"// same as", |
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new Date(tzDate.toISOString()).toISOString() |
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); |
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console.info(); |
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console.info("\t// during standard time"); |
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console.info( |
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`\tXTZ.toUTC("2021-11-07 08:15:59.000", "America/New_York")` |
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); |
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console.info(`\ttzDate.toISOString()`); |
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tzDate = XTZ.toUTC("2021-11-07 08:15:59.000", "America/New_York"); |
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console.info( |
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"\t" + tzDate.toISOString(), |
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"// same as", |
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new Date(tzDate.toISOString()).toISOString() |
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); |
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console.info(); |
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} |
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//
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// Time Zone-relative time translated to UTC
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//
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function demo2() { |
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console.info( |
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"What time is it in New York at 8:15am on March 14th UTC?" |
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); |
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console.info(); |
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console.info("\t// during daylight savings"); |
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console.info( |
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`\tXTZ.toTimeZone("2021-03-14T08:15:59.000Z", "America/New_York")` |
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); |
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console.info(`\ttzDate.toISOString()`); |
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tzDate = XTZ.toTimeZone("2021-03-14T08:15:59.000Z", "America/New_York"); |
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console.info( |
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"\t" + tzDate.toISOString(), |
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"// same as", |
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new Date(tzDate.toISOString()).toISOString() |
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); |
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console.info(); |
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console.info("\t// during standard time"); |
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console.info( |
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`\tXTZ.toUTC("2021-11-07T08:15:59.000Z", "America/New_York")` |
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); |
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console.info(`\ttzDate.toISOString()`); |
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tzDate = XTZ.toUTC("2021-11-07T08:15:59.000Z", "America/New_York"); |
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console.info( |
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"\t" + tzDate.toISOString(), |
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"// same as", |
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new Date(tzDate.toISOString()).toISOString() |
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); |
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console.info(); |
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} |
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demo1(); |
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demo2(); |
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})(); |
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@ -1,171 +0,0 @@ |
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"use strict"; |
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function toTimeZone(date, timeZone) { |
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// ISO string or existing date object
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date = new Date(date); |
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var options = { |
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timeZone: timeZone, |
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year: "numeric", |
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month: "numeric", |
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day: "numeric", |
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hour12: false, |
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hour: "numeric", |
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minute: "numeric", |
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second: "numeric", |
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fractionalSecondDigits: 3, |
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}; |
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var tzOptions = Object.assign({ timeZoneName: "long" }, options); |
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// Every country uses the same year and months, right?
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var formater = new Intl.DateTimeFormat("default", tzOptions); |
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var parts = formater.formatToParts(date); |
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var whole = {}; |
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parts.forEach(function (part) { |
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var val = part.value; |
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switch (part.type) { |
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case "literal": |
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// ignore separators and whitespace characters
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return; |
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case "timeZoneName": |
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// keep as is - it's a string
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break; |
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case "month": |
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// months are 0-indexed for new Date()
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val = parseInt(val, 10) - 1; |
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break; |
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case "hour": |
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// because sometimes 24 is used instead of 0, make 24 0
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val = parseInt(val, 10) % 24; |
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break; |
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case "fractionalSecond": |
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// fractionalSecond is a dumb name - should be millisecond
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whole.millisecond = parseInt(val, 10); |
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return; |
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default: |
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val = parseInt(val, 10); |
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} |
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// whole.month = 0;
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whole[part.type] = val; |
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}); |
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whole.timeZone = timeZone; |
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whole.offset = getOffset(date, whole); |
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whole.toISOString = _toOffsetISOString; |
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return whole; |
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} |
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function toTimeZoneISOString(date, timeZone) { |
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var whole = toTimeZone(date, timeZone); |
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return toOffsetISOString(whole); |
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} |
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function _toOffsetISOString() { |
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return toOffsetISOString(this); |
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} |
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function getOffset(utcDate, tzD2) { |
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var tzDate = new Date(toOffsetISOString(tzD2)); |
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var diff = Math.round(tzDate.valueOf() - utcDate.valueOf()) / (60 * 1000); |
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return diff; |
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} |
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function p2(x) { |
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return String(x).padStart(2, "0"); |
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} |
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function p3(x) { |
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return String(x).padStart(3, "0"); |
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} |
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function formatOffset(minutes) { |
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if (!minutes) { |
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return "Z"; |
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} |
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var h = Math.floor(Math.abs(minutes) / 60); |
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var m = Math.abs(minutes) % 60; |
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var offset = ""; |
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if (minutes > 0) { |
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offset = "+"; |
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} else if (minutes < 0) { |
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offset = "-"; |
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} |
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// +0500, -0730
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return ( |
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offset + h.toString().padStart(2, "0") + m.toString().padStart(2, "0") |
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); |
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} |
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function toOffsetISOString(d) { |
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var offset = formatOffset(d.offset); |
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return ( |
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`${d.year}-${p2(d.month + 1)}-${p2(d.day)}` + |
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`T${p2(d.hour)}:${p2(d.minute)}:${p2(d.second)}.${p3( |
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d.millisecond |
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)}${offset}` |
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); |
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} |
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function toUTC(dt, tz) { |
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if ("string" === typeof dt) { |
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// Either of these formats should work:
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// 2021-03-14 01:15:59
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// 2021-03-14T01:15:59Z
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dt = dt |
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.replace("T", " ") |
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.replace("Z", "") |
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.replace(" ", "T") |
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.replace(/$/, "Z"); |
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} |
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var utcDate = new Date(dt); |
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var tzD2 = toTimeZone(utcDate, tz); |
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var offset = tzD2.offset; |
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tzD2.offset = ""; |
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var deltaDate = new Date(utcDate); |
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deltaDate.setUTCMinutes(deltaDate.getUTCMinutes() - offset); |
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var tzD3 = toTimeZone(deltaDate, tz); |
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if ( |
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tzD3.hour === utcDate.getUTCHours() && |
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tzD3.minute === utcDate.getUTCMinutes() |
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) { |
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return tzD3; |
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} |
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var diff = tzD3.offset - offset; |
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var h = Math.floor(Math.abs(diff) / 60); |
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var m = Math.abs(diff) % 60; |
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var sign = Math.abs(diff) / diff; |
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tzD3.hour -= h * sign; |
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tzD3.minute -= m * sign; |
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return tzD3; |
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} |
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function toUTCISOString(date, timeZone) { |
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var whole = toUTC(date, timeZone); |
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return toOffsetISOString(whole); |
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} |
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module.exports = { |
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// bespoke date =>
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// 2021-11-07T3:15:59-0500
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toOffsetISOString: toOffsetISOString, |
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// -240 => -0400
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formatOffset: formatOffset, |
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// [ "2021-11-07T08:15:59Z", "America/New_York" ]
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// => "2021-11-07T03:15:59-0500" // 2021-11-07 03:15:59
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toTimeZone: toTimeZone, |
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toTimeZoneISOString: toTimeZoneISOString, |
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// [ "2021-11-07 03:15:59", "America/New_York" ]
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// => "2021-11-07T03:15:59-0500" // 2021-11-07T08:15:59Z
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toUTC: toUTC, |
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toUTCISOString: toUTCISOString, |
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}; |
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@ -0,0 +1,29 @@ |
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{ |
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"name": "xtz", |
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"version": "1.0.0", |
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"description": "A fast, lightweight, zero-dependency library to translate between Time Zones and UTC with native Intl.DateTimeFormat in ~100 LoC. For Node.js & Browsers.", |
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"main": "xtz.js", |
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"scripts": { |
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"test": "node ./test.js" |
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}, |
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"repository": { |
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"type": "git", |
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"url": "git+https://github.com/therootcompany/tz.js.git" |
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}, |
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"keywords": [ |
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"tz", |
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"timezone", |
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"date", |
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"intl", |
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"temporal", |
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"polyfill", |
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"convert", |
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"translate" |
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], |
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"author": "AJ ONeal <coolaj86@gmail.com> (https://coolaj86.com/)", |
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"license": "MPL-2.0", |
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"bugs": { |
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"url": "https://github.com/therootcompany/tz.js/issues" |
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}, |
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"homepage": "https://github.com/therootcompany/tz.js#readme" |
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} |
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@ -0,0 +1,182 @@ |
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var XTZ; |
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(function () { |
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"use strict"; |
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function toTimeZone(date, timeZone) { |
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// ISO string or existing date object
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date = new Date(date); |
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var options = { |
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timeZone: timeZone, |
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year: "numeric", |
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month: "numeric", |
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day: "numeric", |
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hour12: false, |
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hour: "numeric", |
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minute: "numeric", |
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second: "numeric", |
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fractionalSecondDigits: 3, |
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}; |
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var tzOptions = Object.assign({ timeZoneName: "long" }, options); |
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// Every country uses the same year and months, right?
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var formater = new Intl.DateTimeFormat("default", tzOptions); |
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var parts = formater.formatToParts(date); |
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var whole = {}; |
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parts.forEach(function (part) { |
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var val = part.value; |
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switch (part.type) { |
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case "literal": |
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// ignore separators and whitespace characters
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return; |
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case "timeZoneName": |
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// keep as is - it's a string
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break; |
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case "month": |
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// months are 0-indexed for new Date()
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val = parseInt(val, 10) - 1; |
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break; |
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case "hour": |
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// because sometimes 24 is used instead of 0, make 24 0
|
|||
val = parseInt(val, 10) % 24; |
|||
break; |
|||
case "fractionalSecond": |
|||
// fractionalSecond is a dumb name - should be millisecond
|
|||
whole.millisecond = parseInt(val, 10); |
|||
return; |
|||
default: |
|||
val = parseInt(val, 10); |
|||
} |
|||
// whole.month = 0;
|
|||
whole[part.type] = val; |
|||
}); |
|||
|
|||
whole.timeZone = timeZone; |
|||
whole.offset = getOffset(date, whole); |
|||
whole.toISOString = _toOffsetISOString; |
|||
return whole; |
|||
} |
|||
|
|||
function toTimeZoneISOString(date, timeZone) { |
|||
var whole = toTimeZone(date, timeZone); |
|||
return toOffsetISOString(whole); |
|||
} |
|||
|
|||
function _toOffsetISOString() { |
|||
return toOffsetISOString(this); |
|||
} |
|||
|
|||
function getOffset(utcDate, tzD2) { |
|||
var tzDate = new Date(toOffsetISOString(tzD2)); |
|||
var diff = |
|||
Math.round(tzDate.valueOf() - utcDate.valueOf()) / (60 * 1000); |
|||
return diff; |
|||
} |
|||
|
|||
function p2(x) { |
|||
return String(x).padStart(2, "0"); |
|||
} |
|||
|
|||
function p3(x) { |
|||
return String(x).padStart(3, "0"); |
|||
} |
|||
|
|||
function formatOffset(minutes) { |
|||
if (!minutes) { |
|||
return "Z"; |
|||
} |
|||
|
|||
var h = Math.floor(Math.abs(minutes) / 60); |
|||
var m = Math.abs(minutes) % 60; |
|||
var offset = ""; |
|||
if (minutes > 0) { |
|||
offset = "+"; |
|||
} else if (minutes < 0) { |
|||
offset = "-"; |
|||
} |
|||
|
|||
// +0500, -0730
|
|||
return ( |
|||
offset + |
|||
h.toString().padStart(2, "0") + |
|||
m.toString().padStart(2, "0") |
|||
); |
|||
} |
|||
|
|||
function toOffsetISOString(d) { |
|||
var offset = formatOffset(d.offset); |
|||
return ( |
|||
`${d.year}-${p2(d.month + 1)}-${p2(d.day)}` + |
|||
`T${p2(d.hour)}:${p2(d.minute)}:${p2(d.second)}.${p3( |
|||
d.millisecond |
|||
)}${offset}` |
|||
); |
|||
} |
|||
|
|||
function toUTC(dt, tz) { |
|||
if ("string" === typeof dt) { |
|||
// Either of these formats should work:
|
|||
// 2021-03-14 01:15:59
|
|||
// 2021-03-14T01:15:59Z
|
|||
dt = dt |
|||
.replace("T", " ") |
|||
.replace("Z", "") |
|||
.replace(" ", "T") |
|||
.replace(/$/, "Z"); |
|||
} |
|||
var utcDate = new Date(dt); |
|||
var tzD2 = toTimeZone(utcDate, tz); |
|||
var offset = tzD2.offset; |
|||
tzD2.offset = ""; |
|||
|
|||
var deltaDate = new Date(utcDate); |
|||
deltaDate.setUTCMinutes(deltaDate.getUTCMinutes() - offset); |
|||
var tzD3 = toTimeZone(deltaDate, tz); |
|||
|
|||
if ( |
|||
tzD3.hour === utcDate.getUTCHours() && |
|||
tzD3.minute === utcDate.getUTCMinutes() |
|||
) { |
|||
return tzD3; |
|||
} |
|||
|
|||
var diff = tzD3.offset - offset; |
|||
var h = Math.floor(Math.abs(diff) / 60); |
|||
var m = Math.abs(diff) % 60; |
|||
var sign = Math.abs(diff) / diff; |
|||
tzD3.hour -= h * sign; |
|||
tzD3.minute -= m * sign; |
|||
|
|||
return tzD3; |
|||
} |
|||
|
|||
function toUTCISOString(date, timeZone) { |
|||
var whole = toUTC(date, timeZone); |
|||
return toOffsetISOString(whole); |
|||
} |
|||
|
|||
XTZ = { |
|||
// bespoke date =>
|
|||
// 2021-11-07T3:15:59-0500
|
|||
toOffsetISOString: toOffsetISOString, |
|||
|
|||
// -240 => -0400
|
|||
formatOffset: formatOffset, |
|||
|
|||
// [ "2021-11-07T08:15:59Z", "America/New_York" ]
|
|||
// => "2021-11-07T03:15:59-0500" // 2021-11-07 03:15:59
|
|||
toTimeZone: toTimeZone, |
|||
toTimeZoneISOString: toTimeZoneISOString, |
|||
|
|||
// [ "2021-11-07 03:15:59", "America/New_York" ]
|
|||
// => "2021-11-07T03:15:59-0500" // 2021-11-07T08:15:59Z
|
|||
toUTC: toUTC, |
|||
toUTCISOString: toUTCISOString, |
|||
}; |
|||
|
|||
if ("undefined" != typeof module && module.exports) { |
|||
module.exports = XTZ; |
|||
} |
|||
}()); |
|||
Loading…
Reference in new issue