mirror of https://github.com/therootcompany/tz.js
Add docs, examples, and prepare to publish
This commit is contained in:
parent
6c38395ce7
commit
f5c99a1a28
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@ -1,3 +1,5 @@
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*.gz
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# ---> Node
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# Logs
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logs
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215
README.md
215
README.md
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@ -1,3 +1,214 @@
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# when.js
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# xtz.js
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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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XTZ is a poor man's Temporal polyfill, but just for time zones.
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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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```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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> What time will it be in New York when it's 7:15am UTC?
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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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```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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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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# 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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Compatible with Node.js & Browsers.
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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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```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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## `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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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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171
index.js
171
index.js
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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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||||
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||||
module.exports = {
|
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// bespoke date =>
|
||||
// 2021-11-07T3:15:59-0500
|
||||
toOffsetISOString: toOffsetISOString,
|
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|
||||
// -240 => -0400
|
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formatOffset: formatOffset,
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|
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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",
|
||||
"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",
|
||||
"scripts": {
|
||||
"test": "node ./test.js"
|
||||
},
|
||||
"repository": {
|
||||
"type": "git",
|
||||
"url": "git+https://github.com/therootcompany/tz.js.git"
|
||||
},
|
||||
"keywords": [
|
||||
"tz",
|
||||
"timezone",
|
||||
"date",
|
||||
"intl",
|
||||
"temporal",
|
||||
"polyfill",
|
||||
"convert",
|
||||
"translate"
|
||||
],
|
||||
"author": "AJ ONeal <coolaj86@gmail.com> (https://coolaj86.com/)",
|
||||
"license": "MPL-2.0",
|
||||
"bugs": {
|
||||
"url": "https://github.com/therootcompany/tz.js/issues"
|
||||
},
|
||||
"homepage": "https://github.com/therootcompany/tz.js#readme"
|
||||
}
|
||||
|
|
@ -0,0 +1,182 @@
|
|||
var XTZ;
|
||||
|
||||
(function () {
|
||||
"use strict";
|
||||
|
||||
function toTimeZone(date, timeZone) {
|
||||
// ISO string or existing date object
|
||||
date = new Date(date);
|
||||
var options = {
|
||||
timeZone: timeZone,
|
||||
year: "numeric",
|
||||
month: "numeric",
|
||||
day: "numeric",
|
||||
hour12: false,
|
||||
hour: "numeric",
|
||||
minute: "numeric",
|
||||
second: "numeric",
|
||||
fractionalSecondDigits: 3,
|
||||
};
|
||||
|
||||
var tzOptions = Object.assign({ timeZoneName: "long" }, options);
|
||||
|
||||
// Every country uses the same year and months, right?
|
||||
var formater = new Intl.DateTimeFormat("default", tzOptions);
|
||||
var parts = formater.formatToParts(date);
|
||||
|
||||
var whole = {};
|
||||
parts.forEach(function (part) {
|
||||
var val = part.value;
|
||||
switch (part.type) {
|
||||
case "literal":
|
||||
// ignore separators and whitespace characters
|
||||
return;
|
||||
case "timeZoneName":
|
||||
// keep as is - it's a string
|
||||
break;
|
||||
case "month":
|
||||
// months are 0-indexed for new Date()
|
||||
val = parseInt(val, 10) - 1;
|
||||
break;
|
||||
case "hour":
|
||||
// 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