mirror of https://github.com/therootcompany/tz.js
docs!: toUTC* to fromTimeZone, toOffsetISOString
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README.md
98
README.md
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@ -15,48 +15,26 @@ TZ.toLocalISOString(new Date()); // "2021-11-07T03:15:59.000-0500"
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TZ.timeZone(); // "America/New_York"
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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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// What will the ISO datetime string be
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// when it's 3:15am in New York?
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//
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// (Relative New York time to Absolute UTC Time)
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TZ.toOffsetISOString("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: 10, 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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// What time will it be in New York
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// when it's 7:15am UTC?
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//
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// (Absolute UTC time to Relative New York time)
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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("2021-03-14T07:15:59.000Z", "America/New_York");
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// "2021-03-14T03:15:59.000-0400"
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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: 2, day: 14,
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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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@ -108,8 +86,8 @@ https://www.youtube.com/playlist?list=PLxki0D-ilnqa6horOJ2G18WMZlJeQFlAt
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- `toLocalISOString(dateOrNull)`
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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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- `fromTimeZone(dtString, timeZone)`
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- `toOffsetISOString(dtString, timeZone)`
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## `toTimeZone(utcDate, timeZone)`
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@ -121,20 +99,33 @@ Use ISO timestamps representing the absolute UTC time (with or without offset):
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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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var utcDate = TZ.toTimeZone("2021-03-14T07:15:59.000Z", "America/New_York");
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// {
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// year: 2021, month: 2, day: 14,
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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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### 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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### 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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### 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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@ -148,14 +139,14 @@ 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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### 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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## `fromTimeZone(dtString, timeZone)`
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> Convert a Target Time Zone into UTC
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@ -165,24 +156,39 @@ Use ISO-like timestamps representing the _local_ time in the target time zone:
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"2021-11-0 03:15:59.000"
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```
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Convert directly to an offset ISO String:
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```js
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var tzDate = TZ.fromTimeZone("2021-11-07 03:15:59.000", "America/New_York");
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// {
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// year: 2021, month: 10, 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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### 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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TZ.toOffsetISOString("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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### 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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var utcDate = TZ.fromTimeZone("2021-11-07 03:15:59.000", "America/New_York");
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```
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### Use a Date as a source time
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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
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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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var utcDate = TZ.fromTimeZone(
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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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@ -207,7 +213,7 @@ 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
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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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var utcDate = TZ.fromTimeZone("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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@ -218,7 +224,7 @@ Q: What happens in November when 1am happens twice?
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- A: Although both 1ams are distinguishable with ISO offset times, only the first can be resolved from a local time
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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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var utcDate = TZ.fromTimeZone("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 1am at "2021-11-07T01:15:59.000-0500")
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18
index.html
18
index.html
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@ -99,8 +99,8 @@ String(((new Date()).getTimezoneOffset() % 60)).padStart(2, '0')</code></pre>
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<hr />
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<form class="js-tz2utc">
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<h3>Relative TimeZone to Absolute UTC:</h3>
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<pre><code>XTZ.toUTC("<span class="js-dtx-tz">YYYY-03-14 03:15:69.000</span>", "<span class="js-tzx-tz">UTC</span>")
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<h3>TimeZone-Relative (Local) to Absolute (ISO+Offset) String:</h3>
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<pre><code>XTZ.fromTimeZone("<span class="js-dtx-tz">YYYY-03-14 03:15:69.000</span>", "<span class="js-tzx-tz">UTC</span>")
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.toISOString()
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// <span class="js-myx-dt-tz"></span></code></pre>
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<label>
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@ -130,14 +130,14 @@ String(((new Date()).getTimezoneOffset() % 60)).padStart(2, '0')</code></pre>
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</label>
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<br />
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<br />
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<button type="submit">Convert to UTC!</button>
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<button type="submit">Convert to ISO+Offset!</button>
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<br />
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</form>
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<hr />
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<form class="js-utc2tz">
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<h3>Absolute UTC to Relative TimeZone</h3>
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<h3>Absolute (UTC) to TimeZone-Relative (ISO+Offset) String:</h3>
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<pre><code>XTZ.toTimeZone("<span class="js-dtx-utc">YYYY-03-14 03:15:69.000</span>", "<span class="js-tzx-utc">UTC</span>")
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.toISOString()
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// <span class="js-myx-dt-utc"></span></code></pre>
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@ -201,17 +201,17 @@ Asia/Kolkata +0530 (No DST) (30-min)</pre
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}
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function translate(dt, tz, tz2) {
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var utc = new Date(XTZ.toUTC(dt, tz).toISOString());
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var utc = new Date(XTZ.fromTimeZone(dt, tz).toISOString());
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if (!tz2) {
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return utc;
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}
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return XTZ.toTimeZone(utc, tz2);
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}
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function toUTC() {
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function fromTimeZone() {
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var curDt = $(".js-dt-tz").value;
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var curTz = $(".js-tz-tz").value;
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$(".js-my-dt-tz").value = XTZ.toUTC(curDt, curTz).toISOString();
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$(".js-my-dt-tz").value = XTZ.fromTimeZone(curDt, curTz).toISOString();
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$(".js-dtx-tz").innerText = curDt;
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$(".js-tzx-tz").innerText = curTz;
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@ -265,10 +265,10 @@ Asia/Kolkata +0530 (No DST) (30-min)</pre
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$("form.js-tz2utc").addEventListener("submit", function (ev) {
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ev.preventDefault();
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ev.stopPropagation();
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toUTC();
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fromTimeZone();
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});
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toUTC();
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fromTimeZone();
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toTZ();
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xTZ();
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</script>
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49
xtz.js
49
xtz.js
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@ -1,6 +1,4 @@
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var XTZ;
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(function () {
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(function (exports) {
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"use strict";
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function toTimeZone(date, timeZone) {
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@ -62,15 +60,16 @@ var XTZ;
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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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return formatAsOffsetISOString(whole);
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}
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function _toOffsetISOString() {
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return toOffsetISOString(this);
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/* jshint validthis: true */
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return formatAsOffsetISOString(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 tzDate = new Date(formatAsOffsetISOString(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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@ -98,10 +97,21 @@ var XTZ;
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}
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// +0500, -0730
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return offset + p2(h) + p2(m);
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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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function toOffsetISOString(date, timeZone) {
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if ("offset" in date && "year" in date) {
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return formatAsOffsetISOString(date);
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}
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var whole = fromTimeZone(date, timeZone);
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return formatAsOffsetISOString(whole);
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}
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function formatAsOffsetISOString(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)}-${p2(d.day)}` +
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@ -111,7 +121,7 @@ var XTZ;
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);
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}
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function toUTC(dt, tz) {
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function fromTimeZone(dt, tz) {
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if ("string" === typeof dt) {
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// Either of these formats should work:
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// 2021-03-14 01:15:59
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@ -148,11 +158,6 @@ var XTZ;
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return tzD3;
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}
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function toUTCISOString(date, timeZone) {
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var whole = toUTC(date, timeZone);
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return toOffsetISOString(whole);
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}
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function toLocalISOString(dateOrStr) {
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var d;
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if (dateOrStr) {
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@ -174,15 +179,17 @@ var XTZ;
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return `${YYYY}-${MM}-${DD}T${hh}:${mm}:${ss}.${sss}${offset}`;
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}
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XTZ = {
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exports.XTZ = {
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// bespoke date =>
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// 2021-11-07T3:15:59-0500
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// (todo?)
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// xtzToISOString: formatAsOffsetISOString,
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// (deprecated)
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toOffsetISOString: toOffsetISOString,
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// -240 => -0400
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formatOffset: formatOffset,
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// new Date() => "2021-11-07T03:15:59-0500"
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toLocalISOString: toLocalISOString,
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// [ "2021-11-07T08:15:59Z", "America/New_York" ]
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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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toUTC: fromTimeZone,
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fromTimeZone: fromTimeZone,
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// deprecated
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toUTCISOString: toOffsetISOString,
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};
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if ("undefined" != typeof module && module.exports) {
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module.exports = XTZ;
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module.exports = exports.XTZ;
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}
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})();
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})(("undefined" === typeof module && window) || exports);
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