Compare commits

..

No commits in common. "5c35bd2148805b78231b3c5fea2ff2381977044a" and "de3f74a572d59407193ebc2946fb421691d21b09" have entirely different histories.

9 changed files with 580 additions and 763 deletions

View File

@ -1 +0,0 @@
*.min.js

View File

@ -1,7 +0,0 @@
{
"printWidth": 80,
"tabWidth": 2,
"singleQuote": false,
"bracketSpacing": true,
"semi": true
}

View File

@ -1,12 +1,10 @@
# [xtz.js](https://github.com/therootcompany/tz.js) # [xtz.js](https://github.com/therootcompany/tz.js)
A fast, lightweight, zero-dependency library to translate between Time Zones and UTC with native `Intl.DateTimeFormat` A fast, lightweight, zero-dependency library to
in ~100 LoC. For Node.js & Browsers. translate between Time Zones and UTC with native
`Intl.DateTimeFormat` in ~100 LoC. For Node.js & Browsers.
[![](./xtz-preview.png)](https://therootcompany.github.io/tz.js/) XTZ is a poor man's Temporal polyfill, but just for time zones.
XTZ is a poor man's `Temporal` polyfill, but just for time zones. \
Demo: <https://therootcompany.github.io/tz.js/>
> What UTC time will it be when it's 3:15am in New York? > What UTC time will it be when it's 3:15am in New York?
@ -19,7 +17,7 @@ TZ.toUTCISOString("2021-11-07 03:15:59.000", "America/New_York");
```js ```js
var tzDate = TZ.toUTC("2021-11-07 03:15:59.000", "America/New_York"); var tzDate = TZ.toUTC("2021-11-07 03:15:59.000", "America/New_York");
// { // {
// year: 2021, month: 10, day: 7, // year: 2021, month: 11, day: 7,
// hour: 3, minute: 15, second: 59, millisecond: 0, // hour: 3, minute: 15, second: 59, millisecond: 0,
// offset: -300, timeZoneName: "Eastern Standard Time" // offset: -300, timeZoneName: "Eastern Standard Time"
// } // }
@ -40,7 +38,7 @@ TZ.toTimeZoneISOString("2021-03-14T07:15:59.000Z", "America/New_York");
```js ```js
var utcDate = TZ.toTimeZone("2021-03-14T07:15:59.000Z", "America/New_York"); var utcDate = TZ.toTimeZone("2021-03-14T07:15:59.000Z", "America/New_York");
// { // {
// year: 2021, month: 2, day: 14, // year: 2021, month: 3, day: 14,
// hour: 3, minute: 15, second: 59, millisecond: 0, // hour: 3, minute: 15, second: 59, millisecond: 0,
// offset: -240, timeZoneName: "Eastern Daylight Time" // offset: -240, timeZoneName: "Eastern Daylight Time"
// } // }
@ -55,23 +53,12 @@ utcDate.toISOString();
- [x] Translate a UTC time to a Time Zone - [x] Translate a UTC time to a Time Zone
- [x] Translate a Zoned time to UTC - [x] Translate a Zoned time to UTC
- [x] Handles **Daylight Savings**, Weird Time Zones, etc... - [x] Handles **Daylight Savings**, Weird Time Zones, etc...
- [x] Well-tested `npm run test`
- [x] Lightweight (No deps) - [x] Lightweight (No deps)
- 5kb Source + Comments - 5kb Source + Comments
- 2.5kb Minified - 2.5kb Minified
- <1kb `gzip`d - <1kb `gzip`d
Compatible with Browsers, and Node.js. Compatible with Node.js & Browsers.
## Browsers
```html
<script src="https://unpkg.com/xtz@latest/xtz.min.js"></script>
```
```js
var TZ = window.XTZ;
```
## Node.js & Webpack ## Node.js & Webpack
@ -83,9 +70,15 @@ npm install --save xtz
var TZ = require("xtz"); var TZ = require("xtz");
``` ```
## Demo ## Browsers
See <https://therootcompany.github.io/tz.js/>. ```html
<script src="https://unpkg.com/xtz@1.0.0-rc.1/xtz.min.js"></script>
```
```js
var TZ = window.XTZ;
```
# API # API
@ -98,7 +91,7 @@ See <https://therootcompany.github.io/tz.js/>.
> Convert UTC into a Target Time Zone > Convert UTC into a Target Time Zone
Use ISO timestamps representing the absolute UTC time (with or without offset): Use ISO timestamps representing the absolute UTC time in the target time zone:
```txt ```txt
"2021-11-07T08:15:59.000Z" "2021-11-07T08:15:59.000Z"
@ -145,7 +138,7 @@ new Date("2021-11-07T03:15:59.000-0500").toISOString());
Use ISO-like timestamps representing the _local_ time in the target time zone: Use ISO-like timestamps representing the _local_ time in the target time zone:
```txt ```txt
"2021-11-0 03:15:59.000" "2021-11-0 T03:15:59.000"
``` ```
Convert directly to an offset ISO String: Convert directly to an offset ISO String:
@ -161,8 +154,7 @@ Or our bespoke date object:
var utcDate = TZ.toUTC("2021-11-07 03:15:59.000", "America/New_York"); var utcDate = TZ.toUTC("2021-11-07 03:15:59.000", "America/New_York");
``` ```
You can also use a date object as the source time, but the date's UTC time will be treated as **_relative to time 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).
zone_** rather than absolute (this is a workaround for JavaScript's lack of bi-directional timezone support).
```js ```js
var utcDate = TZ.toUTC( var utcDate = TZ.toUTC(
@ -180,15 +172,14 @@ utcDate.toISOString();
> In 2021 Daylight Savings (in the US) > In 2021 Daylight Savings (in the US)
> >
> - begins at 2am on March 14th (skips to 3am) > - begins at 2am on March 14th
> - ends at 2am on November 7th (resets to 1am) > - ends at 2am on November 7th
> >
> See <https://www.timeanddate.com/time/change/usa>. > See <https://www.timeanddate.com/time/change/usa>.
Q: What happens in March when 2am is skipped? Q: What happens in March when 2am is skipped?
- A: Although 2am is not a valid time, rather than throwing an error this library will resolve to 1am instead, which - 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.
is an hour early in real ("tick-tock" or "monotonic") time.
```js ```js
var utcDate = TZ.toUTC("2021-03-14 02:15:59.000", "America/New_York"); var utcDate = TZ.toUTC("2021-03-14 02:15:59.000", "America/New_York");
utcDate.toISOString(); utcDate.toISOString();
@ -196,15 +187,14 @@ Q: What happens in March when 2am is skipped?
// (same as "2021-03-14T01:15:59.000-0500") // (same as "2021-03-14T01:15:59.000-0500")
``` ```
Q: What happens in November when 1am happens twice? Q: What happens in November when 2am happens twice?
- A: Although both 1ams are distinguishable with ISO offset times, only the first can be resolved from a local time - A: Although both 2ams are distinguishable with ISO offset times, only the first can be resolved from a local time with this library.
with this library.
```js ```js
var utcDate = TZ.toUTC("2021-11-07 01:15:59.000", "America/New_York"); var utcDate = TZ.toUTC("2021-11-07 01:15:59.000", "America/New_York");
utcDate.toISOString(); utcDate.toISOString();
// "2021-11-07T01:15:59.000-0400", same as "2021-11-07T05:15:59.000Z" // "2021-11-07T01:15:59.000-0400", same as "2021-11-07T05:15:59.000Z"
// (an hour before the 2nd 1am at "2021-11-07T01:15:59.000-0500") // (an hour before the 2nd 2am at "2021-11-07T01:15:59.000-0500")
``` ```
# List of Time Zones # List of Time Zones

View File

@ -22,7 +22,9 @@ var XTZ;
console.info(); console.info();
console.info("\t// during daylight savings"); console.info("\t// during daylight savings");
console.info(`\tXTZ.toUTC("2021-03-14 08:15:59.000", "America/New_York")`); console.info(
`\tXTZ.toUTC("2021-03-14 08:15:59.000", "America/New_York")`
);
console.info(`\ttzDate.toISOString()`); console.info(`\ttzDate.toISOString()`);
tzDate = XTZ.toUTC("2021-03-14 08:15:59.000", "America/New_York"); tzDate = XTZ.toUTC("2021-03-14 08:15:59.000", "America/New_York");
console.info( console.info(
@ -33,7 +35,9 @@ var XTZ;
console.info(); console.info();
console.info("\t// during standard time"); console.info("\t// during standard time");
console.info(`\tXTZ.toUTC("2021-11-07 08:15:59.000", "America/New_York")`); console.info(
`\tXTZ.toUTC("2021-11-07 08:15:59.000", "America/New_York")`
);
console.info(`\ttzDate.toISOString()`); console.info(`\ttzDate.toISOString()`);
tzDate = XTZ.toUTC("2021-11-07 08:15:59.000", "America/New_York"); tzDate = XTZ.toUTC("2021-11-07 08:15:59.000", "America/New_York");
console.info( console.info(
@ -48,7 +52,9 @@ var XTZ;
// Time Zone-relative time translated to UTC // Time Zone-relative time translated to UTC
// //
function demo2() { function demo2() {
console.info("What time is it in New York at 8:15am on March 14th UTC?"); console.info(
"What time is it in New York at 8:15am on March 14th UTC?"
);
console.info(); console.info();
console.info("\t// during daylight savings"); console.info("\t// during daylight savings");
@ -65,7 +71,9 @@ var XTZ;
console.info(); console.info();
console.info("\t// during standard time"); console.info("\t// during standard time");
console.info(`\tXTZ.toUTC("2021-11-07T08:15:59.000Z", "America/New_York")`); console.info(
`\tXTZ.toUTC("2021-11-07T08:15:59.000Z", "America/New_York")`
);
console.info(`\ttzDate.toISOString()`); console.info(`\ttzDate.toISOString()`);
tzDate = XTZ.toUTC("2021-11-07T08:15:59.000Z", "America/New_York"); tzDate = XTZ.toUTC("2021-11-07T08:15:59.000Z", "America/New_York");
console.info( console.info(

View File

@ -1,175 +0,0 @@
<!DOCTYPE html>
<html lang="en" class="no-js">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width" />
<title>Convert TimeZones in Your Browser</title>
<link rel="canonical" href="https://therootcompany.github.io/tz.js/" />
<meta name="theme-color" content="#FF00FF" />
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/spcss@0.7.0" />
<style>
input {
width: 24em;
}
</style>
</head>
<body>
<!-- Content -->
<h1>
<a href="https://github.com/therootcompany/tz.js" target="_blank"
>XTZ.js</a
>
</h1>
<h3>
Current Time:
<br />
<span class="js-my-dt">YYYY-MM-DDThh:mm:ss.mmm+0000</span>
</h3>
Current Time Zone: <span class="js-my-tz">America/XXXX</span>
<br />
Current Time Offset: <span class="js-my-offset">-0000</span>
<hr />
<form class="js-tz2utc">
<h3>Relative TimeZone to Absolute UTC:</h3>
<label>
Time:
<input
class="js-dt-tz"
type="text"
placeholder="ex: 2021-03-14 03:15:69.000"
required
/>
</label>
<br />
<label>
Zone:
<input
class="js-tz-tz"
type="text"
placeholder="ex: America/New_York"
required
/>
</label>
<br />
<label>
ISO:
<input class="js-my-dt-tz" type="text" disabled />
</label>
<br />
<br />
<button type="submit">Convert to UTC!</button>
<br />
</form>
<hr />
<form class="js-utc2tz">
<h3>Absolute UTC to Relative TimeZone</h3>
<label>
Time:
<input
class="js-dt-utc"
type="text"
placeholder="ex: 2021-03-14 03:15:69.000"
required
/>
</label>
<br />
<label>
Zone:
<input
class="js-tz-utc"
type="text"
placeholder="ex: America/New_York"
required
/>
</label>
<br />
<label>
ISO:
<input class="js-my-dt-utc" type="text" disabled />
</label>
<br />
<br />
<button type="submit">Convert to TZ!</button>
<br />
</form>
<hr />
<h3>Time Zones List</h3>
See the
<a href="https://en.wikipedia.org/wiki/List_of_tz_database_time_zones"
>Full List of Time Zones</a
>
on Wikipedia.
<pre>
America/New_York -0500 -0400 (Eastern Time)
America/Denver -0700 -0600 (Mountain Time)
America/Phoenix -0700 (No DST) (Arizona Time)
America/Los_Angeles -0800 -0700 (Pacific Time)
Australia/Adelaide +0930 +1030 (30-min)
Asia/Kathmandu +0545 (No DST) (45-min)
Asia/Kolkata +0530 (No DST) (30-min)</pre
>
<hr />
Code at
<a href="https://github.com/therootcompany/tz.js" target="_blank"
>github.com/therootcompany/tz.js</a
>
<script src="./xtz.js"></script>
<script>
function $(sel, el) {
return (el || document.body).querySelector(sel);
}
function toUTC() {
var curDt = $(".js-dt-tz").value;
var curTz = $(".js-tz-tz").value;
$(".js-my-dt-tz").value = XTZ.toUTC(curDt, curTz).toISOString();
}
function toTZ() {
var curDt = $(".js-dt-utc").value;
var curTz = $(".js-tz-utc").value;
$(".js-my-dt-utc").value = XTZ.toTimeZone(curDt, curTz).toISOString();
}
var myTz = new Intl.DateTimeFormat("default", {}).resolvedOptions()
.timeZone;
$(".js-my-tz").innerText = myTz;
$(".js-tz-tz").value = myTz;
$(".js-tz-utc").value = myTz;
$(".js-my-offset").innerText = -1 * new Date().getTimezoneOffset();
var myDate = new Date();
$(".js-my-dt").innerText = XTZ.toTimeZone(myDate, myTz).toISOString();
$(".js-dt-tz").value = XTZ.toTimeZone(myDate, myTz)
.toISOString()
.replace("T", " ")
.replace(/(Z|(\+|-)\d+)$/, "");
$(".js-dt-utc").value = myDate.toISOString();
$("form.js-utc2tz").addEventListener("submit", function (ev) {
ev.preventDefault();
ev.stopPropagation();
toTZ();
});
$("form.js-tz2utc").addEventListener("submit", function (ev) {
ev.preventDefault();
ev.stopPropagation();
toUTC();
});
toUTC();
toTZ();
</script>
</body>
</html>

View File

@ -1,11 +1,10 @@
{ {
"name": "xtz", "name": "xtz",
"version": "1.0.1", "version": "1.0.0",
"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.", "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.",
"main": "xtz.js", "main": "xtz.js",
"scripts": { "scripts": {
"test": "node ./test.js", "test": "node ./test.js"
"build": "uglifyjs ./xtz.js > ./xtz.min.js ; gzip -k -f ./xtz.min.js"
}, },
"repository": { "repository": {
"type": "git", "type": "git",

Binary file not shown.

Before

Width:  |  Height:  |  Size: 80 KiB

11
xtz.js
View File

@ -49,7 +49,7 @@ var XTZ;
default: default:
val = parseInt(val, 10); val = parseInt(val, 10);
} }
// ex: whole.month = 0; // whole.month = 0;
whole[part.type] = val; whole[part.type] = val;
}); });
@ -70,7 +70,8 @@ var XTZ;
function getOffset(utcDate, tzD2) { function getOffset(utcDate, tzD2) {
var tzDate = new Date(toOffsetISOString(tzD2)); var tzDate = new Date(toOffsetISOString(tzD2));
var diff = Math.round(tzDate.valueOf() - utcDate.valueOf()) / (60 * 1000); var diff =
Math.round(tzDate.valueOf() - utcDate.valueOf()) / (60 * 1000);
return diff; return diff;
} }
@ -98,7 +99,9 @@ var XTZ;
// +0500, -0730 // +0500, -0730
return ( return (
offset + h.toString().padStart(2, "0") + m.toString().padStart(2, "0") offset +
h.toString().padStart(2, "0") +
m.toString().padStart(2, "0")
); );
} }
@ -176,4 +179,4 @@ var XTZ;
if ("undefined" != typeof module && module.exports) { if ("undefined" != typeof module && module.exports) {
module.exports = XTZ; module.exports = XTZ;
} }
})(); }());