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tz.js
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docs: correct and clarify UTC vs ISO+Offset

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AJ ONeal 2022-03-09 23:52:13 -07:00
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README.md
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@ -9,17 +9,17 @@ XTZ is a poor man's `Temporal` polyfill, but just for time zones. \
Demo: <https://therootcompany.github.io/tz.js/> Demo: <https://therootcompany.github.io/tz.js/>
```js ```js
// What's the current time, in ISO format? // What's the current time, in ISO+Offset format?
TZ.toLocalISOString(new Date()); // "2021-11-07T03:15:59.000-0500" TZ.toLocalISOString(new Date()); // "2021-11-07T03:15:59.000-0500"
TZ.timeZone(); // "America/New_York" TZ.timeZone(); // "America/New_York"
``` ```
```js ```js
// What will the ISO datetime string be // What will the ISO+Offset datetime string be
// when it's 3:15am in New York? // when it's 3:15am in New York?
// //
// (Relative New York time to Absolute UTC Time) // (Relative New York time to Absolute ISO+Offset Time)
TZ.toOffsetISOString("2021-11-07 03:15:59.000", "America/New_York"); TZ.toOffsetISOString("2021-11-07 03:15:59.000", "America/New_York");
// "2021-11-07T03:15:59.000-0500" // "2021-11-07T03:15:59.000-0500"
@ -29,7 +29,7 @@ TZ.toOffsetISOString("2021-11-07 03:15:59.000", "America/New_York");
// What time will it be in New York // What time will it be in New York
// when it's 7:15am UTC? // when it's 7:15am UTC?
// //
// (Absolute UTC time to Relative New York time) // (Absolute UTC Zulu time to Relative New York time)
TZ.toTimeZoneISOString("2021-03-14T07:15:59.000Z", "America/New_York"); TZ.toTimeZoneISOString("2021-03-14T07:15:59.000Z", "America/New_York");
// "2021-03-14T03:15:59.000-0400" // "2021-03-14T03:15:59.000-0400"
@ -37,8 +37,8 @@ TZ.toTimeZoneISOString("2021-03-14T07:15:59.000Z", "America/New_York");
# Features # Features
- [x] Translate a UTC time to a Time Zone - [x] Translate a UTC Zulu time to a Time Zone
- [x] Translate a Zoned time to UTC - [x] Translate a Zoned time to ISO+Offset
- [x] Handles **Daylight Savings**, Weird Time Zones, etc... - [x] Handles **Daylight Savings**, Weird Time Zones, etc...
- [x] Well-tested `npm run test` - [x] Well-tested `npm run test`
- [x] Lightweight (No deps) - [x] Lightweight (No deps)
@ -93,7 +93,7 @@ https://www.youtube.com/playlist?list=PLxki0D-ilnqa6horOJ2G18WMZlJeQFlAt
> 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 (ISO with or without offset):
```txt ```txt
"2021-11-07T08:15:59.000Z" "2021-11-07T08:15:59.000Z"
@ -125,7 +125,7 @@ TZ.toTimeZoneISOString("2021-11-07T08:15:59.000Z", "America/New_York");
var tzDate = TZ.toTimeZone("2021-11-07T08:15:59.000Z", "America/New_York"); var tzDate = TZ.toTimeZone("2021-11-07T08:15:59.000Z", "America/New_York");
``` ```
### You can also use a date object with an absolute UTC time: ### You can also use a date object with an absolute ISO time:
```js ```js
var tzDate = TZ.toTimeZone( var tzDate = TZ.toTimeZone(
@ -148,7 +148,7 @@ new Date("2021-11-07T03:15:59.000-0500").toISOString());
## `fromTimeZone(dtString, timeZone)` ## `fromTimeZone(dtString, timeZone)`
> Convert a Target Time Zone into UTC > Convert a Target Time Zone into ISO
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: