make Prettier
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*.min.js
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{
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"printWidth": 80,
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"tabWidth": 2,
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"singleQuote": false,
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"bracketSpacing": true,
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"semi": true
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}
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14
README.md
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README.md
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# [xtz.js](https://github.com/therootcompany/tz.js)
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# [xtz.js](https://github.com/therootcompany/tz.js)
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A fast, lightweight, zero-dependency library to
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A fast, lightweight, zero-dependency library to translate between Time Zones and UTC with native `Intl.DateTimeFormat`
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translate between Time Zones and UTC with native
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in ~100 LoC. For Node.js & Browsers.
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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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XTZ is a poor man's Temporal polyfill, but just for time zones.
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@ -155,7 +154,8 @@ Or our bespoke date object:
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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.toUTC("2021-11-07 03:15:59.000", "America/New_York");
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```
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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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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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```js
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var utcDate = TZ.toUTC(
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var utcDate = TZ.toUTC(
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@ -180,7 +180,8 @@ utcDate.toISOString();
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Q: What happens in March when 2am is skipped?
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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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- 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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```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.toUTC("2021-03-14 02:15:59.000", "America/New_York");
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utcDate.toISOString();
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utcDate.toISOString();
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@ -190,7 +191,8 @@ Q: What happens in March when 2am is skipped?
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Q: What happens in November when 2am happens twice?
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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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- A: Although both 2ams 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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```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.toUTC("2021-11-07 01:15:59.000", "America/New_York");
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utcDate.toISOString();
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utcDate.toISOString();
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16
examples.js
16
examples.js
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@ -22,9 +22,7 @@ var XTZ;
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console.info();
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console.info();
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console.info("\t// during daylight savings");
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console.info("\t// during daylight savings");
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console.info(
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console.info(`\tXTZ.toUTC("2021-03-14 08:15:59.000", "America/New_York")`);
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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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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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tzDate = XTZ.toUTC("2021-03-14 08:15:59.000", "America/New_York");
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console.info(
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console.info(
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console.info();
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console.info();
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console.info("\t// during standard time");
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console.info("\t// during standard time");
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console.info(
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console.info(`\tXTZ.toUTC("2021-11-07 08:15:59.000", "America/New_York")`);
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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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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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tzDate = XTZ.toUTC("2021-11-07 08:15:59.000", "America/New_York");
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console.info(
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console.info(
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// Time Zone-relative time translated to UTC
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// Time Zone-relative time translated to UTC
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//
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//
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function demo2() {
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function demo2() {
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console.info(
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console.info("What time is it in New York at 8:15am on March 14th UTC?");
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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();
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console.info("\t// during daylight savings");
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console.info("\t// during daylight savings");
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console.info();
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console.info();
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console.info("\t// during standard time");
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console.info("\t// during standard time");
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console.info(
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console.info(`\tXTZ.toUTC("2021-11-07T08:15:59.000Z", "America/New_York")`);
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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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console.info(`\ttzDate.toISOString()`);
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tzDate = XTZ.toUTC("2021-11-07T08:15:59.000Z", "America/New_York");
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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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console.info(
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9
xtz.js
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xtz.js
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@ -70,8 +70,7 @@ var XTZ;
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function getOffset(utcDate, tzD2) {
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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(toOffsetISOString(tzD2));
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var diff =
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var diff = Math.round(tzDate.valueOf() - utcDate.valueOf()) / (60 * 1000);
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Math.round(tzDate.valueOf() - utcDate.valueOf()) / (60 * 1000);
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return diff;
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return diff;
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}
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}
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// +0500, -0730
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// +0500, -0730
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return (
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return (
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offset +
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offset + h.toString().padStart(2, "0") + m.toString().padStart(2, "0")
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h.toString().padStart(2, "0") +
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m.toString().padStart(2, "0")
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);
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);
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}
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}
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if ("undefined" != typeof module && module.exports) {
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if ("undefined" != typeof module && module.exports) {
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module.exports = XTZ;
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module.exports = XTZ;
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}
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}
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}());
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})();
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