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  1. 1
      .prettierignore
  2. 7
      .prettierrc.json
  3. 114
      README.md
  4. 142
      examples.js
  5. 175
      index.html
  6. 5
      package.json
  7. 556
      test.js
  8. BIN
      xtz-preview.png
  9. 339
      xtz.js

1
.prettierignore

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

7
.prettierrc.json

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

114
README.md

@ -1,10 +1,12 @@
# [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` in ~100 LoC. For Node.js & Browsers.
A fast, lightweight, zero-dependency library to translate between Time Zones and UTC with native `Intl.DateTimeFormat`
in ~100 LoC. For Node.js & Browsers.
XTZ is a poor man's Temporal polyfill, but just for time zones.
[![](./xtz-preview.png)](https://therootcompany.github.io/tz.js/)
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?
@ -17,7 +19,7 @@ TZ.toUTCISOString("2021-11-07 03:15:59.000", "America/New_York");
```js
var tzDate = TZ.toUTC("2021-11-07 03:15:59.000", "America/New_York");
// {
// year: 2021, month: 11, day: 7,
// year: 2021, month: 10, day: 7,
// hour: 3, minute: 15, second: 59, millisecond: 0,
// offset: -300, timeZoneName: "Eastern Standard Time"
// }
@ -38,7 +40,7 @@ TZ.toTimeZoneISOString("2021-03-14T07:15:59.000Z", "America/New_York");
```js
var utcDate = TZ.toTimeZone("2021-03-14T07:15:59.000Z", "America/New_York");
// {
// year: 2021, month: 3, day: 14,
// year: 2021, month: 2, day: 14,
// hour: 3, minute: 15, second: 59, millisecond: 0,
// offset: -240, timeZoneName: "Eastern Daylight Time"
// }
@ -50,48 +52,53 @@ utcDate.toISOString();
# Features
- [x] Translate a UTC time to a Time Zone
- [x] Translate a Zoned time to UTC
- [x] Handles **Daylight Savings**, Weird Time Zones, etc...
- [x] Lightweight (No deps)
- 5kb Source + Comments
- 2.5kb Minified
- <1kb `gzip`d
- [x] Translate a UTC time to a Time Zone
- [x] Translate a Zoned time to UTC
- [x] Handles **Daylight Savings**, Weird Time Zones, etc...
- [x] Well-tested `npm run test`
- [x] Lightweight (No deps)
- 5kb Source + Comments
- 2.5kb Minified
- <1kb `gzip`d
Compatible with Node.js & Browsers.
Compatible with Browsers, and Node.js.
## Node.js & Webpack
## Browsers
```bash
npm install --save xtz
```html
<script src="https://unpkg.com/xtz@latest/xtz.min.js"></script>
```
```js
var TZ = require("xtz");
var TZ = window.XTZ;
```
## Browsers
## Node.js & Webpack
```html
<script src="https://unpkg.com/xtz@1.0.0-rc.1/xtz.min.js"></script>
```bash
npm install --save xtz
```
```js
var TZ = window.XTZ;
var TZ = require("xtz");
```
## Demo
See <https://therootcompany.github.io/tz.js/>.
# API
- `toTimeZone(utcDate, timeZone)`
- `toTimeZoneISOString(isoString, timeZone)`
- `toUTC(dtString, timeZone)`
- `toUTCISOString(dtString, timeZone)`
- `toTimeZone(utcDate, timeZone)`
- `toTimeZoneISOString(isoString, timeZone)`
- `toUTC(dtString, timeZone)`
- `toUTCISOString(dtString, timeZone)`
## `toTimeZone(utcDate, timeZone)`
> Convert UTC into a Target Time Zone
Use ISO timestamps representing the absolute UTC time in the target time zone:
Use ISO timestamps representing the absolute UTC time (with or without offset):
```txt
"2021-11-07T08:15:59.000Z"
@ -114,8 +121,8 @@ You can also use a date object with an absolute UTC time:
```js
var tzDate = TZ.toTimeZone(
new Date("2021-11-07T08:15:59.000Z"),
"America/New_York"
new Date("2021-11-07T08:15:59.000Z"),
"America/New_York"
);
```
@ -138,7 +145,7 @@ new Date("2021-11-07T03:15:59.000-0500").toISOString());
Use ISO-like timestamps representing the _local_ time in the target time zone:
```txt
"2021-11-0 T03:15:59.000"
"2021-11-0 03:15:59.000"
```
Convert directly to an offset ISO String:
@ -154,12 +161,13 @@ Or our bespoke date object:
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 zone_** rather than absolute (this is a workaround for JavaScript's lack of bi-directional timezone support).
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).
```js
var utcDate = TZ.toUTC(
new Date("2021-11-07T03:15:59.000Z"),
"America/New_York"
new Date("2021-11-07T03:15:59.000Z"),
"America/New_York"
);
```
@ -172,30 +180,32 @@ utcDate.toISOString();
> In 2021 Daylight Savings (in the US)
>
> - begins at 2am on March 14th
> - ends at 2am on November 7th
> - begins at 2am on March 14th (skips to 3am)
> - ends at 2am on November 7th (resets to 1am)
>
> See <https://www.timeanddate.com/time/change/usa>.
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 is an hour early in real ("tick-tock" or "monotonic") time.
```js
var utcDate = TZ.toUTC("2021-03-14 02:15:59.000", "America/New_York");
utcDate.toISOString();
// "2021-03-14T02:15:59.000-0400"
// (same as "2021-03-14T01:15:59.000-0500")
```
Q: What happens in November when 2am happens twice?
- A: Although both 2ams are distinguishable with ISO offset times, only the first can be resolved from a local time with this library.
```js
var utcDate = TZ.toUTC("2021-11-07 01:15:59.000", "America/New_York");
utcDate.toISOString();
// "2021-11-07T01:15:59.000-0400", same as "2021-11-07T05:15:59.000Z"
// (an hour before the 2nd 2am at "2021-11-07T01:15:59.000-0500")
```
- 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.
```js
var utcDate = TZ.toUTC("2021-03-14 02:15:59.000", "America/New_York");
utcDate.toISOString();
// "2021-03-14T02:15:59.000-0400"
// (same as "2021-03-14T01:15:59.000-0500")
```
Q: What happens in November when 1am happens twice?
- A: Although both 1ams are distinguishable with ISO offset times, only the first can be resolved from a local time
with this library.
```js
var utcDate = TZ.toUTC("2021-11-07 01:15:59.000", "America/New_York");
utcDate.toISOString();
// "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")
```
# List of Time Zones

142
examples.js

@ -1,89 +1,81 @@
var XTZ;
(function () {
"use strict";
"use strict";
if (!XTZ) {
try {
XTZ = require("xtz");
} catch (e) {
XTZ = require("./xtz.js");
}
if (!XTZ) {
try {
XTZ = require("xtz");
} catch (e) {
XTZ = require("./xtz.js");
}
}
var TZ = XTZ;
var tzDate;
var TZ = XTZ;
var tzDate;
//
// UTC-absolute time translated to a Time Zone
//
function demo1() {
console.info("What's the UTC equivalent of 8:15am in New York?");
console.info();
//
// UTC-absolute time translated to a Time Zone
//
function demo1() {
console.info("What's the UTC equivalent of 8:15am in New York?");
console.info();
console.info("\t// during daylight savings");
console.info(
`\tXTZ.toUTC("2021-03-14 08:15:59.000", "America/New_York")`
);
console.info(`\ttzDate.toISOString()`);
tzDate = XTZ.toUTC("2021-03-14 08:15:59.000", "America/New_York");
console.info(
"\t" + tzDate.toISOString(),
"// same as",
new Date(tzDate.toISOString()).toISOString()
);
console.info();
console.info("\t// during daylight savings");
console.info(`\tXTZ.toUTC("2021-03-14 08:15:59.000", "America/New_York")`);
console.info(`\ttzDate.toISOString()`);
tzDate = XTZ.toUTC("2021-03-14 08:15:59.000", "America/New_York");
console.info(
"\t" + tzDate.toISOString(),
"// same as",
new Date(tzDate.toISOString()).toISOString()
);
console.info();
console.info("\t// during standard time");
console.info(
`\tXTZ.toUTC("2021-11-07 08:15:59.000", "America/New_York")`
);
console.info(`\ttzDate.toISOString()`);
tzDate = XTZ.toUTC("2021-11-07 08:15:59.000", "America/New_York");
console.info(
"\t" + tzDate.toISOString(),
"// same as",
new Date(tzDate.toISOString()).toISOString()
);
console.info();
}
console.info("\t// during standard time");
console.info(`\tXTZ.toUTC("2021-11-07 08:15:59.000", "America/New_York")`);
console.info(`\ttzDate.toISOString()`);
tzDate = XTZ.toUTC("2021-11-07 08:15:59.000", "America/New_York");
console.info(
"\t" + tzDate.toISOString(),
"// same as",
new Date(tzDate.toISOString()).toISOString()
);
console.info();
}
//
// Time Zone-relative time translated to UTC
//
function demo2() {
console.info(
"What time is it in New York at 8:15am on March 14th UTC?"
);
console.info();
//
// Time Zone-relative time translated to UTC
//
function demo2() {
console.info("What time is it in New York at 8:15am on March 14th UTC?");
console.info();
console.info("\t// during daylight savings");
console.info(
`\tXTZ.toTimeZone("2021-03-14T08:15:59.000Z", "America/New_York")`
);
console.info(`\ttzDate.toISOString()`);
tzDate = XTZ.toTimeZone("2021-03-14T08:15:59.000Z", "America/New_York");
console.info(
"\t" + tzDate.toISOString(),
"// same as",
new Date(tzDate.toISOString()).toISOString()
);
console.info();
console.info("\t// during daylight savings");
console.info(
`\tXTZ.toTimeZone("2021-03-14T08:15:59.000Z", "America/New_York")`
);
console.info(`\ttzDate.toISOString()`);
tzDate = XTZ.toTimeZone("2021-03-14T08:15:59.000Z", "America/New_York");
console.info(
"\t" + tzDate.toISOString(),
"// same as",
new Date(tzDate.toISOString()).toISOString()
);
console.info();
console.info("\t// during standard time");
console.info(
`\tXTZ.toUTC("2021-11-07T08:15:59.000Z", "America/New_York")`
);
console.info(`\ttzDate.toISOString()`);
tzDate = XTZ.toUTC("2021-11-07T08:15:59.000Z", "America/New_York");
console.info(
"\t" + tzDate.toISOString(),
"// same as",
new Date(tzDate.toISOString()).toISOString()
);
console.info();
}
console.info("\t// during standard time");
console.info(`\tXTZ.toUTC("2021-11-07T08:15:59.000Z", "America/New_York")`);
console.info(`\ttzDate.toISOString()`);
tzDate = XTZ.toUTC("2021-11-07T08:15:59.000Z", "America/New_York");
console.info(
"\t" + tzDate.toISOString(),
"// same as",
new Date(tzDate.toISOString()).toISOString()
);
console.info();
}
demo1();
demo2();
demo1();
demo2();
})();

175
index.html

@ -0,0 +1,175 @@
<!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>

5
package.json

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

556
test.js

@ -3,314 +3,314 @@
var TZ = require("./");
function testUtcToTz(t) {
var result = TZ.toTimeZone.apply(TZ, t.inputs).toISOString();
if (t.result !== result) {
throw new Error(
`Invalid UTC to TZ conversion for ${t.desc}:\n` +
`\tExpected: ${t.result}\n` +
`\tActual: ${result}\n`
);
}
var result = TZ.toTimeZone.apply(TZ, t.inputs).toISOString();
if (t.result !== result) {
throw new Error(
`Invalid UTC to TZ conversion for ${t.desc}:\n` +
`\tExpected: ${t.result}\n` +
`\tActual: ${result}\n`
);
}
}
function testTzToUtc(t) {
var result = TZ.toUTC.apply(TZ, t.inputs);
if (t.result !== result.toISOString()) {
console.log(result);
throw new Error(
`Invalid TZ to UTC conversion for ${t.desc}:\n` +
`\tExpected: ${t.result}\n` +
`\tActual: ${result.toISOString()}\n`
);
}
var result = TZ.toUTC.apply(TZ, t.inputs);
if (t.result !== result.toISOString()) {
console.log(result);
throw new Error(
`Invalid TZ to UTC conversion for ${t.desc}:\n` +
`\tExpected: ${t.result}\n` +
`\tActual: ${result.toISOString()}\n`
);
}
}
// At this real UTC time, what does the timezone translate it to?
[
//
// Start-of-DST Tests
//
//
// Start-of-DST Tests
//
// [Start]
// What time is '2021-03-14 01:15:59.000 in New York' in UTC? // 2021-03-14 06:15:59.000
// // 2021-03-14T01:15:59.000-0500
// What time is '2021-03-14 02:15:59.000 in New York' in UTC? // 2021-03-14 07:15:59.000
// // 2021-03-14T03:15:59.000-0400
// What time is '2021-03-14 03:15:59.000 in New York' in UTC? // 2021-03-14 07:15:59.000
// // 2021-03-14T03:15:59.000-0400
// What time is '2021-03-14 04:15:59.000 in New York' in UTC? // 2021-03-14 08:15:59.000
// // 2021-03-14T04:15:59.000-0400
// [End]
// [Start]
// What time is '2021-03-14 01:15:59.000 in New York' in UTC? // 2021-03-14 06:15:59.000
// // 2021-03-14T01:15:59.000-0500
// What time is '2021-03-14 02:15:59.000 in New York' in UTC? // 2021-03-14 07:15:59.000
// // 2021-03-14T03:15:59.000-0400
// What time is '2021-03-14 03:15:59.000 in New York' in UTC? // 2021-03-14 07:15:59.000
// // 2021-03-14T03:15:59.000-0400
// What time is '2021-03-14 04:15:59.000 in New York' in UTC? // 2021-03-14 08:15:59.000
// // 2021-03-14T04:15:59.000-0400
// [End]
// 12:15am NY -0500 => -0400
{
desc: "UTC to 12:15am NY EST",
inputs: ["2021-03-14T05:15:59.000Z", "America/New_York"],
result: "2021-03-14T00:15:59.000-0500",
},
{
desc: "UTC to 12:15am NY EST (2)",
inputs: ["2021-03-14T00:15:59.000-0500", "America/New_York"],
result: "2021-03-14T00:15:59.000-0500",
},
// 1:15am NY (non-DST)
{
desc: "UTC to 1:15am NY EST",
inputs: ["2021-03-14T06:15:59.000Z", "America/New_York"],
result: "2021-03-14T01:15:59.000-0500",
},
{
desc: "UTC to 1:15am NY EST (2)",
inputs: ["2021-03-14T01:15:59.000-0500", "America/New_York"],
result: "2021-03-14T01:15:59.000-0500",
},
// 12:15am NY -0500 => -0400
{
desc: "UTC to 12:15am NY EST",
inputs: ["2021-03-14T05:15:59.000Z", "America/New_York"],
result: "2021-03-14T00:15:59.000-0500",
},
{
desc: "UTC to 12:15am NY EST (2)",
inputs: ["2021-03-14T00:15:59.000-0500", "America/New_York"],
result: "2021-03-14T00:15:59.000-0500",
},
// 1:15am NY (non-DST)
{
desc: "UTC to 1:15am NY EST",
inputs: ["2021-03-14T06:15:59.000Z", "America/New_York"],
result: "2021-03-14T01:15:59.000-0500",
},
{
desc: "UTC to 1:15am NY EST (2)",
inputs: ["2021-03-14T01:15:59.000-0500", "America/New_York"],
result: "2021-03-14T01:15:59.000-0500",
},
// NOTE: Can't 2:15am NY, because it does not exist (skipped by DST)
// NOTE: Can't 2:15am NY, because it does not exist (skipped by DST)
// 3:15am NY (DST)
{
desc: "UTC to 3:15am NY EDT",
inputs: ["2021-03-14T07:15:59.000Z", "America/New_York"],
result: "2021-03-14T03:15:59.000-0400",
},
{
desc: "UTC to 3:15am NY EDT (2)",
inputs: ["2021-03-14T03:15:59.000-0400", "America/New_York"],
result: "2021-03-14T03:15:59.000-0400",
},
// 4:15am NY
{
desc: "UTC to 4:15am NY EDT",
inputs: ["2021-03-14T08:15:59.000Z", "America/New_York"],
result: "2021-03-14T04:15:59.000-0400",
},
{
desc: "UTC to 4:15am NY EDT (2)",
inputs: ["2021-03-14T04:15:59.000-0400", "America/New_York"],
result: "2021-03-14T04:15:59.000-0400",
},
// 3:15am NY (DST)
{
desc: "UTC to 3:15am NY EDT",
inputs: ["2021-03-14T07:15:59.000Z", "America/New_York"],
result: "2021-03-14T03:15:59.000-0400",
},
{
desc: "UTC to 3:15am NY EDT (2)",
inputs: ["2021-03-14T03:15:59.000-0400", "America/New_York"],
result: "2021-03-14T03:15:59.000-0400",
},
// 4:15am NY
{
desc: "UTC to 4:15am NY EDT",
inputs: ["2021-03-14T08:15:59.000Z", "America/New_York"],
result: "2021-03-14T04:15:59.000-0400",
},
{
desc: "UTC to 4:15am NY EDT (2)",
inputs: ["2021-03-14T04:15:59.000-0400", "America/New_York"],
result: "2021-03-14T04:15:59.000-0400",
},
//
// End-of-DST Tests
//
//
// End-of-DST Tests
//
// [Start]
// What time is '2021-11-07 01:15:59.000 in New York' in UTC? // 2021-11-07 05:15:59.000
// // 2021-11-07T01:15:59.000-0400
// // 2021-11-07 06:15:59.000
// // 2021-11-07T01:15:59.000-0500
// What time is '2021-11-07 02:15:59.000 in New York' in UTC? // 2021-11-07 07:15:59.000
// // 2021-11-07T02:15:59.000-0500
// What time is '2021-11-07 03:15:59.000 in New York' in UTC? // 2021-11-07 08:15:59.000
// [End]
// [Start]
// What time is '2021-11-07 01:15:59.000 in New York' in UTC? // 2021-11-07 05:15:59.000
// // 2021-11-07T01:15:59.000-0400
// // 2021-11-07 06:15:59.000
// // 2021-11-07T01:15:59.000-0500
// What time is '2021-11-07 02:15:59.000 in New York' in UTC? // 2021-11-07 07:15:59.000
// // 2021-11-07T02:15:59.000-0500
// What time is '2021-11-07 03:15:59.000 in New York' in UTC? // 2021-11-07 08:15:59.000
// [End]
// 12:15am NY -0400 => -0500
{
desc: "UTC to 2021 Nov 7, 12:15am NY EDT",
inputs: ["2021-11-07T04:15:59.000Z", "America/New_York"],
result: "2021-11-07T00:15:59.000-0400",
},
{
desc: "UTC to 2021 Nov 7, 12:15am NY EDT (2)",
inputs: ["2021-11-07T00:15:59.000-0400", "America/New_York"],
result: "2021-11-07T00:15:59.000-0400",
},
// 1:15am NY (DST) -0400
// NOTE: 1:15am happens TWICE (with different offsets)
{
desc: "UTC to 2021 Nov 7, 1:15am NY EDT",
inputs: ["2021-11-07T05:15:59.000Z", "America/New_York"],
result: "2021-11-07T01:15:59.000-0400",
},
{
desc: "UTC to 2021 Nov 7, 1:15am NY EDT (2)",
inputs: ["2021-11-07T01:15:59.000-0400", "America/New_York"],
result: "2021-11-07T01:15:59.000-0400",
},
// 1:15am NY (non-DST) -0500
{
desc: "UTC to 2021 Nov 7, 1:15am NY EST",
inputs: ["2021-11-07T06:15:59.000Z", "America/New_York"],
result: "2021-11-07T01:15:59.000-0500",
},
{
desc: "UTC to 2021 Nov 7, 1:15am NY EST (2)",
inputs: ["2021-11-07T01:15:59.000-0500", "America/New_York"],
result: "2021-11-07T01:15:59.000-0500",
},
// 2:15am NY -0500
{
desc: "UTC to 2021 Nov 7, 2:15am NY EST",
inputs: ["2021-11-07T07:15:59.000Z", "America/New_York"],
result: "2021-11-07T02:15:59.000-0500",
},
{
desc: "UTC to 2021 Nov 7, 2:15am NY EST (2)",
inputs: ["2021-11-07T02:15:59.000-0500", "America/New_York"],
result: "2021-11-07T02:15:59.000-0500",
},
// 3:15am NY
{
desc: "UTC to 2021 Nov 7, 3:15am NY EST",
inputs: ["2021-11-07T08:15:59.000Z", "America/New_York"],
result: "2021-11-07T03:15:59.000-0500",
},
{
desc: "UTC to 2021 Nov 7, 3:15am NY EST (2)",
inputs: ["2021-11-07T03:15:59.000-0500", "America/New_York"],
result: "2021-11-07T03:15:59.000-0500",
},
// 12:15am NY -0400 => -0500
{
desc: "UTC to 2021 Nov 7, 12:15am NY EDT",
inputs: ["2021-11-07T04:15:59.000Z", "America/New_York"],
result: "2021-11-07T00:15:59.000-0400",
},
{
desc: "UTC to 2021 Nov 7, 12:15am NY EDT (2)",
inputs: ["2021-11-07T00:15:59.000-0400", "America/New_York"],
result: "2021-11-07T00:15:59.000-0400",
},
// 1:15am NY (DST) -0400
// NOTE: 1:15am happens TWICE (with different offsets)
{
desc: "UTC to 2021 Nov 7, 1:15am NY EDT",
inputs: ["2021-11-07T05:15:59.000Z", "America/New_York"],
result: "2021-11-07T01:15:59.000-0400",
},
{
desc: "UTC to 2021 Nov 7, 1:15am NY EDT (2)",
inputs: ["2021-11-07T01:15:59.000-0400", "America/New_York"],
result: "2021-11-07T01:15:59.000-0400",
},
// 1:15am NY (non-DST) -0500
{
desc: "UTC to 2021 Nov 7, 1:15am NY EST",
inputs: ["2021-11-07T06:15:59.000Z", "America/New_York"],
result: "2021-11-07T01:15:59.000-0500",
},
{
desc: "UTC to 2021 Nov 7, 1:15am NY EST (2)",
inputs: ["2021-11-07T01:15:59.000-0500", "America/New_York"],
result: "2021-11-07T01:15:59.000-0500",
},
// 2:15am NY -0500
{
desc: "UTC to 2021 Nov 7, 2:15am NY EST",
inputs: ["2021-11-07T07:15:59.000Z", "America/New_York"],
result: "2021-11-07T02:15:59.000-0500",
},
{
desc: "UTC to 2021 Nov 7, 2:15am NY EST (2)",
inputs: ["2021-11-07T02:15:59.000-0500", "America/New_York"],
result: "2021-11-07T02:15:59.000-0500",
},
// 3:15am NY
{
desc: "UTC to 2021 Nov 7, 3:15am NY EST",
inputs: ["2021-11-07T08:15:59.000Z", "America/New_York"],
result: "2021-11-07T03:15:59.000-0500",
},
{
desc: "UTC to 2021 Nov 7, 3:15am NY EST (2)",
inputs: ["2021-11-07T03:15:59.000-0500", "America/New_York"],
result: "2021-11-07T03:15:59.000-0500",
},
//
// Positive Offset Test
//
//
// Positive Offset Test
//
// Colombo +0530 (not DST)
{
desc: "UTC to Asia/Colombo (1)",
inputs: ["2021-03-14T08:15:59.000Z", "Asia/Colombo"],
result: "2021-03-14T13:45:59.000+0530",
},
{
desc: "UTC to Asia/Colombo (2)",
inputs: ["2021-03-14T13:45:59.000+0530", "Asia/Colombo"],
result: "2021-03-14T13:45:59.000+0530",
},
{
desc: "UTC to Asia/Colombo (3)",
inputs: ["2021-11-07T08:15:59.000Z", "Asia/Colombo"],
result: "2021-11-07T13:45:59.000+0530",
},
{
desc: "UTC to Asia/Colombo (4)",
inputs: ["2021-11-07T13:45:59.000+0530", "Asia/Colombo"],
result: "2021-11-07T13:45:59.000+0530",
},
// Colombo +0530 (not DST)
{
desc: "UTC to Asia/Colombo (1)",
inputs: ["2021-03-14T08:15:59.000Z", "Asia/Colombo"],
result: "2021-03-14T13:45:59.000+0530",
},
{
desc: "UTC to Asia/Colombo (2)",
inputs: ["2021-03-14T13:45:59.000+0530", "Asia/Colombo"],
result: "2021-03-14T13:45:59.000+0530",
},
{
desc: "UTC to Asia/Colombo (3)",
inputs: ["2021-11-07T08:15:59.000Z", "Asia/Colombo"],
result: "2021-11-07T13:45:59.000+0530",
},
{
desc: "UTC to Asia/Colombo (4)",
inputs: ["2021-11-07T13:45:59.000+0530", "Asia/Colombo"],
result: "2021-11-07T13:45:59.000+0530",
},
].forEach(testUtcToTz);
console.info("Pass: UTC to TZ for America/New_York and Asia/Colombo");
[
//
// Start-of-DST Tests
//
//
// Start-of-DST Tests
//
// [Start]
// What time is '2021-03-14 01:15:59.000 in New York' in UTC? // 2021-03-14 06:15:59.000
// // 2021-03-14T01:15:59.000-0500
// What time is '2021-03-14 02:15:59.000 in New York' in UTC? // 2021-03-14 07:15:59.000
// // 2021-03-14T03:15:59.000-0400
// What time is '2021-03-14 03:15:59.000 in New York' in UTC? // 2021-03-14 07:15:59.000
// // 2021-03-14T03:15:59.000-0400
// What time is '2021-03-14 04:15:59.000 in New York' in UTC? // 2021-03-14 08:15:59.000
// // 2021-03-14T04:15:59.000-0400
// [End]
// [Start]
// What time is '2021-03-14 01:15:59.000 in New York' in UTC? // 2021-03-14 06:15:59.000
// // 2021-03-14T01:15:59.000-0500
// What time is '2021-03-14 02:15:59.000 in New York' in UTC? // 2021-03-14 07:15:59.000
// // 2021-03-14T03:15:59.000-0400
// What time is '2021-03-14 03:15:59.000 in New York' in UTC? // 2021-03-14 07:15:59.000
// // 2021-03-14T03:15:59.000-0400
// What time is '2021-03-14 04:15:59.000 in New York' in UTC? // 2021-03-14 08:15:59.000
// // 2021-03-14T04:15:59.000-0400
// [End]
// 12:15am NY -0500 => -0400
{
// 2021-03-14T05:15:59.000Z
desc: "2021 Mar 14, 12:15am NY EST to UTC",
inputs: ["2021-03-14 00:15:59.000", "America/New_York"],
result: "2021-03-14T00:15:59.000-0500",
},
// 1:15am NY (non-DST)
{
// 2021-03-14T06:15:59.000Z
desc: "2021 Mar 14, 1:15am NY EST to UTC",
inputs: ["2021-03-14 01:15:59.000", "America/New_York"],
result: "2021-03-14T01:15:59.000-0500",
},
// 12:15am NY -0500 => -0400
{
// 2021-03-14T05:15:59.000Z
desc: "2021 Mar 14, 12:15am NY EST to UTC",
inputs: ["2021-03-14 00:15:59.000", "America/New_York"],
result: "2021-03-14T00:15:59.000-0500",
},
// 1:15am NY (non-DST)
{
// 2021-03-14T06:15:59.000Z
desc: "2021 Mar 14, 1:15am NY EST to UTC",
inputs: ["2021-03-14 01:15:59.000", "America/New_York"],
result: "2021-03-14T01:15:59.000-0500",
},
// NOTE: Can't 2:15am NY, because it does not exist (skipped by DST)
// This test is here to document the "undefined" behavior
{
// Both 2021-03-14T06:15:59.000Z and 2021-03-14T07:15:59.000Z
// would be reasonable substitutions, I think
desc: "2021 Mar 14, 2:15am NY ExT to UTC",
inputs: ["2021-03-14 02:15:59.000", "America/New_York"],
//result: "2021-03-14T01:15:59.000-0500", // 2021-03-14T06:15:59.000Z
result: "2021-03-14T02:15:59.000-0400", // 2021-03-14T06:15:59.000Z
//result: "2021-03-14T02:15:59.000-0500", // 2021-03-14T07:15:59.000Z
},
// NOTE: Can't 2:15am NY, because it does not exist (skipped by DST)
// This test is here to document the "undefined" behavior
{
// Both 2021-03-14T06:15:59.000Z and 2021-03-14T07:15:59.000Z
// would be reasonable substitutions, I think
desc: "2021 Mar 14, 2:15am NY ExT to UTC",
inputs: ["2021-03-14 02:15:59.000", "America/New_York"],
//result: "2021-03-14T01:15:59.000-0500", // 2021-03-14T06:15:59.000Z
result: "2021-03-14T02:15:59.000-0400", // 2021-03-14T06:15:59.000Z
//result: "2021-03-14T02:15:59.000-0500", // 2021-03-14T07:15:59.000Z
},
// 3:15am NY (DST)
{
// 2021-03-14T07:15:59.000Z
desc: "2021 Mar 14, 3:15am NY EDT to UTC",
inputs: ["2021-03-14 03:15:59.000", "America/New_York"],
result: "2021-03-14T03:15:59.000-0400",
},
// 4:15am NY
{
// 2021-03-14T08:15:59.000Z
desc: "2021 Mar 14, 4:15am NY EDT to UTC",
inputs: ["2021-03-14 04:15:59.000", "America/New_York"],
result: "2021-03-14T04:15:59.000-0400",
},
// 3:15am NY (DST)
{
// 2021-03-14T07:15:59.000Z
desc: "2021 Mar 14, 3:15am NY EDT to UTC",
inputs: ["2021-03-14 03:15:59.000", "America/New_York"],
result: "2021-03-14T03:15:59.000-0400",
},
// 4:15am NY
{
// 2021-03-14T08:15:59.000Z
desc: "2021 Mar 14, 4:15am NY EDT to UTC",
inputs: ["2021-03-14 04:15:59.000", "America/New_York"],
result: "2021-03-14T04:15:59.000-0400",
},
//
// End-of-DST Tests
//
//
// End-of-DST Tests
//
// [Start]
// What time is '2021-11-07 01:15:59.000 in New York' in UTC? // 2021-11-07 05:15:59.000
// // 2021-11-07T01:15:59.000-0400
// // 2021-11-07 06:15:59.000
// // 2021-11-07T01:15:59.000-0500
// What time is '2021-11-07 02:15:59.000 in New York' in UTC? // 2021-11-07 07:15:59.000
// // 2021-11-07T02:15:59.000-0500
// What time is '2021-11-07 03:15:59.000 in New York' in UTC? // 2021-11-07 08:15:59.000
// [End]
// [Start]
// What time is '2021-11-07 01:15:59.000 in New York' in UTC? // 2021-11-07 05:15:59.000
// // 2021-11-07T01:15:59.000-0400
// // 2021-11-07 06:15:59.000
// // 2021-11-07T01:15:59.000-0500
// What time is '2021-11-07 02:15:59.000 in New York' in UTC? // 2021-11-07 07:15:59.000
// // 2021-11-07T02:15:59.000-0500
// What time is '2021-11-07 03:15:59.000 in New York' in UTC? // 2021-11-07 08:15:59.000
// [End]
// 12:15am NY -0400 => -0500
{
// 2021-11-07T04:15:59.000Z
desc: "2021 Nov 7, 12:15am NY EDT to UTC",
inputs: ["2021-11-07 00:15:59.000", "America/New_York"],
result: "2021-11-07T00:15:59.000-0400",
},
// 12:15am NY -0400 => -0500
{
// 2021-11-07T04:15:59.000Z
desc: "2021 Nov 7, 12:15am NY EDT to UTC",
inputs: ["2021-11-07 00:15:59.000", "America/New_York"],
result: "2021-11-07T00:15:59.000-0400",
},
// 1:15am NY (DST) -0400
// NOTE: 1:15am happens TWICE (with different offsets), so we skip one
{
// ==> 2021-11-07T05:15:59.000Z
// [Skip] 2021-11-07T06:15:59.000Z
desc: "2021 Nov 7, 1:15am NY ExT to UTC",
inputs: ["2021-11-07 01:15:59.000", "America/New_York"],
result: "2021-11-07T01:15:59.000-0400", // 2021-11-07T05:15:59.000Z
//result: "2021-11-07T01:15:59.000-0500", // 2021-11-07T06:15:59.000Z
},
// 1:15am NY (DST) -0400
// NOTE: 1:15am happens TWICE (with different offsets), so we skip one
{
// ==> 2021-11-07T05:15:59.000Z
// [Skip] 2021-11-07T06:15:59.000Z
desc: "2021 Nov 7, 1:15am NY ExT to UTC",
inputs: ["2021-11-07 01:15:59.000", "America/New_York"],
result: "2021-11-07T01:15:59.000-0400", // 2021-11-07T05:15:59.000Z
//result: "2021-11-07T01:15:59.000-0500", // 2021-11-07T06:15:59.000Z
},
// 2:15am NY -0500
{
// 2021-11-07T07:15:59.000Z
desc: "2021 Nov 7, 2:15am NY EST to UTC",
inputs: ["2021-11-07 02:15:59.000", "America/New_York"],
result: "2021-11-07T02:15:59.000-0500",
},
// 3:15am NY
{
// 2021-11-07T08:15:59.000Z
desc: "2021 Nov 7, 3:15am NY EST to UTC",
inputs: ["2021-11-07 03:15:59.000", "America/New_York"],
result: "2021-11-07T03:15:59.000-0500",
},
// 2:15am NY -0500
{
// 2021-11-07T07:15:59.000Z
desc: "2021 Nov 7, 2:15am NY EST to UTC",
inputs: ["2021-11-07 02:15:59.000", "America/New_York"],
result: "2021-11-07T02:15:59.000-0500",
},
// 3:15am NY
{
// 2021-11-07T08:15:59.000Z
desc: "2021 Nov 7, 3:15am NY EST to UTC",
inputs: ["2021-11-07 03:15:59.000", "America/New_York"],
result: "2021-11-07T03:15:59.000-0500",
},
//
// Positive Offset Test
//
//
// Positive Offset Test
//
// Colombo +0530 (not DST)
{
// 2021-03-14T08:15:59.000Z
desc: "Asia/Colombo to UTC (1)",
inputs: ["2021-03-14 13:45:59.000", "Asia/Colombo"],
result: "2021-03-14T13:45:59.000+0530",
},
{
// 2021-03-14T08:15:59.000Z
desc: "Asia/Colombo to UTC (2)",
inputs: ["2021-11-07 13:45:59.000", "Asia/Colombo"],
result: "2021-11-07T13:45:59.000+0530",
},
// Colombo +0530 (not DST)
{
// 2021-03-14T08:15:59.000Z
desc: "Asia/Colombo to UTC (1)",
inputs: ["2021-03-14 13:45:59.000", "Asia/Colombo"],
result: "2021-03-14T13:45:59.000+0530",
},
{
// 2021-03-14T08:15:59.000Z
desc: "Asia/Colombo to UTC (2)",
inputs: ["2021-11-07 13:45:59.000", "Asia/Colombo"],
result: "2021-11-07T13:45:59.000+0530",
},
].forEach(testTzToUtc);
console.info("Pass: TZ to UTC for America/New_York and Asia/Colombo");

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xtz.js

@ -1,182 +1,179 @@
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");
}
"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,
};
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")
);
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);
}
// ex: 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";
}
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}`
);
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 = "-";
}
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(/$/, "Z");
}
var utcDate = new Date(dt);
var tzD2 = toTimeZone(utcDate, tz);
var offset = tzD2.offset;
tzD2.offset = "";
var deltaDate = new Date(utcDate);
deltaDate.setUTCMinutes(deltaDate.getUTCMinutes() - offset);
var tzD3 = toTimeZone(deltaDate, tz);
if (
tzD3.hour === utcDate.getUTCHours() &&
tzD3.minute === utcDate.getUTCMinutes()
) {
return tzD3;
}
var diff = tzD3.offset - offset;
var h = Math.floor(Math.abs(diff) / 60);
var m = Math.abs(diff) % 60;
var sign = Math.abs(diff) / diff;
tzD3.hour -= h * sign;
tzD3.minute -= m * sign;
return tzD3;
// +0500, -0730
return (
offset + h.toString().padStart(2, "0") + m.toString().padStart(2, "0")
);
}
function toOffsetISOString(d) {
var offset = formatOffset(d.offset);
return (
`${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");
}
function toUTCISOString(date, timeZone) {
var whole = toUTC(date, timeZone);
return toOffsetISOString(whole);
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;
}
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;
}
}());
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;
}
})();

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