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121
README.md
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@ -8,37 +8,52 @@ in ~100 LoC. For Node.js & Browsers.
XTZ is a poor man's `Temporal` polyfill, but just for time zones. \ XTZ is a poor man's `Temporal` polyfill, but just for time zones. \
Demo: <https://therootcompany.github.io/tz.js/> Demo: <https://therootcompany.github.io/tz.js/>
```js > What UTC time will it be when it's 3:15am in New York?
// What's the current time, in ISO+Offset format?
TZ.toLocalISOString(new Date()); // "2021-11-07T03:15:59.000-0500"
TZ.timeZone(); // "America/New_York"
```
```js ```js
// What will the ISO+Offset datetime string be // Relative New York time to Absolute UTC Time
// when it's 3:15am in New York? TZ.toUTCISOString("2021-11-07 03:15:59.000", "America/New_York");
//
// (Relative New York time to Absolute ISO+Offset Time)
TZ.toOffsetISOString("2021-11-07 03:15:59.000", "America/New_York");
// "2021-11-07T03:15:59.000-0500" // "2021-11-07T03:15:59.000-0500"
``` ```
```js ```js
// What time will it be in New York var tzDate = TZ.toUTC("2021-11-07 03:15:59.000", "America/New_York");
// when it's 7:15am UTC? // {
// // year: 2021, month: 10, day: 7,
// (Absolute UTC Zulu time to Relative New York time) // hour: 3, minute: 15, second: 59, millisecond: 0,
// offset: -300, timeZoneName: "Eastern Standard Time"
// }
tzDate.toISOString();
// "2021-11-07T03:15:59.000-0500"
// (same as "2021-11-07T08:15:59.000Z")
```
> What time will it be in New York when it's 7:15am UTC?
```js
// Absolute UTC time to Relative New York time
TZ.toTimeZoneISOString("2021-03-14T07:15:59.000Z", "America/New_York"); TZ.toTimeZoneISOString("2021-03-14T07:15:59.000Z", "America/New_York");
// "2021-03-14T03:15:59.000-0400" // "2021-03-14T03:15:59.000-0400"
``` ```
```js
var utcDate = TZ.toTimeZone("2021-03-14T07:15:59.000Z", "America/New_York");
// {
// year: 2021, month: 2, day: 14,
// hour: 3, minute: 15, second: 59, millisecond: 0,
// offset: -240, timeZoneName: "Eastern Daylight Time"
// }
utcDate.toISOString();
// "2021-03-14T03:15:59.000-0400"
// (same as "2021-11-07T07:15:59.000Z")
```
# Features # Features
- [x] Translate a UTC Zulu time to a Time Zone - [x] Translate a UTC time to a Time Zone
- [x] Translate a Zoned time to ISO+Offset - [x] Translate a Zoned time to UTC
- [x] Handles **Daylight Savings**, Weird Time Zones, etc... - [x] Handles **Daylight Savings**, Weird Time Zones, etc...
- [x] Well-tested `npm run test` - [x] Well-tested `npm run test`
- [x] Lightweight (No deps) - [x] Lightweight (No deps)
@ -72,60 +87,37 @@ var TZ = require("xtz");
See <https://therootcompany.github.io/tz.js/>. See <https://therootcompany.github.io/tz.js/>.
## How was this built?
I live-streamed the creation of this entire project.
If you'd like to learn how I did it and what challenges I encountered, you can watch here:
https://www.youtube.com/playlist?list=PLxki0D-ilnqa6horOJ2G18WMZlJeQFlAt
(though there have been a few minor updates and bug fixes off-camera)
# API # API
- `toLocalISOString(dateOrNull)`
- `toTimeZone(utcDate, timeZone)` - `toTimeZone(utcDate, timeZone)`
- `toTimeZoneISOString(isoString, timeZone)` - `toTimeZoneISOString(isoString, timeZone)`
- `fromTimeZone(dtString, timeZone)` - `toUTC(dtString, timeZone)`
- `toOffsetISOString(dtString, timeZone)` - `toUTCISOString(dtString, timeZone)`
## `toTimeZone(utcDate, timeZone)` ## `toTimeZone(utcDate, timeZone)`
> Convert UTC into a Target Time Zone > Convert UTC into a Target Time Zone
Use ISO timestamps representing the absolute UTC time (ISO with or without offset): Use ISO timestamps representing the absolute UTC time (with or without offset):
```txt ```txt
"2021-11-07T08:15:59.000Z" "2021-11-07T08:15:59.000Z"
``` ```
```js Convert directly to an ISO String:
var utcDate = TZ.toTimeZone("2021-03-14T07:15:59.000Z", "America/New_York");
// {
// year: 2021, month: 2, day: 14,
// hour: 3, minute: 15, second: 59, millisecond: 0,
// offset: -240, timeZoneName: "Eastern Daylight Time"
// }
utcDate.toISOString();
// "2021-03-14T03:15:59.000-0400"
// (same as "2021-11-07T07:15:59.000Z")
```
### Convert directly to an ISO String:
```js ```js
TZ.toTimeZoneISOString("2021-11-07T08:15:59.000Z", "America/New_York"); TZ.toTimeZoneISOString("2021-11-07T08:15:59.000Z", "America/New_York");
// "2021-11-07T03:15:59.000-0500" // "2021-11-07T03:15:59.000-0500"
``` ```
### Or use our bespoke (custom) date object: Or use our bespoke (custom) date object:
```js ```js
var tzDate = TZ.toTimeZone("2021-11-07T08:15:59.000Z", "America/New_York"); var tzDate = TZ.toTimeZone("2021-11-07T08:15:59.000Z", "America/New_York");
``` ```
### You can also use a date object with an absolute ISO time: You can also use a date object with an absolute UTC time:
```js ```js
var tzDate = TZ.toTimeZone( var tzDate = TZ.toTimeZone(
@ -139,16 +131,16 @@ console.log(tzDate.toISOString());
// "2021-11-07T03:15:59.000-0500" // "2021-11-07T03:15:59.000-0500"
``` ```
### Our ISO Strings + Offsets work with JavaScript's native Date object!! Our ISO Strings + Offsets work with JavaScript's native Date object!!
```js ```js
new Date("2021-11-07T03:15:59.000-0500").toISOString()); new Date("2021-11-07T03:15:59.000-0500").toISOString());
// "2021-11-07T08:15:59.000Z" // "2021-11-07T08:15:59.000Z"
``` ```
## `fromTimeZone(dtString, timeZone)` ## `toUTC(dtString, timeZone)`
> Convert a Target Time Zone into ISO > Convert a Target Time Zone into UTC
Use ISO-like timestamps representing the _local_ time in the target time zone: Use ISO-like timestamps representing the _local_ time in the target time zone:
@ -156,39 +148,24 @@ Use ISO-like timestamps representing the _local_ time in the target time zone:
"2021-11-0 03:15:59.000" "2021-11-0 03:15:59.000"
``` ```
```js Convert directly to an offset ISO String:
var tzDate = TZ.fromTimeZone("2021-11-07 03:15:59.000", "America/New_York");
// {
// year: 2021, month: 10, day: 7,
// hour: 3, minute: 15, second: 59, millisecond: 0,
// offset: -300, timeZoneName: "Eastern Standard Time"
// }
tzDate.toISOString();
// "2021-11-07T03:15:59.000-0500"
// (same as "2021-11-07T08:15:59.000Z")
```
### Convert directly to an offset ISO String:
```js ```js
TZ.toOffsetISOString("2021-11-07 03:15:59.000", "America/New_York"); TZ.toUTCISOString("2021-11-07 03:15:59.000", "America/New_York");
// "2021-11-07T03:15:59.000-0500" // "2021-11-07T03:15:59.000-0500"
``` ```
### Or our bespoke date object: Or our bespoke date object:
```js ```js
var utcDate = TZ.fromTimeZone("2021-11-07 03:15:59.000", "America/New_York"); var utcDate = TZ.toUTC("2021-11-07 03:15:59.000", "America/New_York");
``` ```
### Use a Date as a source time
You can also use a date object as the source time, but the date's UTC time will be treated as **_relative to time 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). zone_** rather than absolute (this is a workaround for JavaScript's lack of bi-directional timezone support).
```js ```js
var utcDate = TZ.fromTimeZone( var utcDate = TZ.toUTC(
new Date("2021-11-07T03:15:59.000Z"), new Date("2021-11-07T03:15:59.000Z"),
"America/New_York" "America/New_York"
); );
@ -213,7 +190,7 @@ 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 - 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. is an hour early in real ("tick-tock" or "monotonic") time.
```js ```js
var utcDate = TZ.fromTimeZone("2021-03-14 02:15:59.000", "America/New_York"); var utcDate = TZ.toUTC("2021-03-14 02:15:59.000", "America/New_York");
utcDate.toISOString(); utcDate.toISOString();
// "2021-03-14T02:15:59.000-0400" // "2021-03-14T02:15:59.000-0400"
// (same as "2021-03-14T01:15:59.000-0500") // (same as "2021-03-14T01:15:59.000-0500")
@ -224,7 +201,7 @@ 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 - A: Although both 1ams are distinguishable with ISO offset times, only the first can be resolved from a local time
with this library. with this library.
```js ```js
var utcDate = TZ.fromTimeZone("2021-11-07 01:15:59.000", "America/New_York"); var utcDate = TZ.toUTC("2021-11-07 01:15:59.000", "America/New_York");
utcDate.toISOString(); utcDate.toISOString();
// "2021-11-07T01:15:59.000-0400", same as "2021-11-07T05:15:59.000Z" // "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") // (an hour before the 2nd 1am at "2021-11-07T01:15:59.000-0500")

12
examples.js
View File

@ -22,9 +22,9 @@ var XTZ;
console.info(); console.info();
console.info("\t// during daylight savings"); console.info("\t// during daylight savings");
console.info(`\tXTZ.fromTimeZone("2021-03-14 08:15:59.000", "America/New_York")`); console.info(`\tXTZ.toUTC("2021-03-14 08:15:59.000", "America/New_York")`);
console.info(`\ttzDate.toISOString()`); console.info(`\ttzDate.toISOString()`);
tzDate = XTZ.fromTimeZone("2021-03-14 08:15:59.000", "America/New_York"); tzDate = XTZ.toUTC("2021-03-14 08:15:59.000", "America/New_York");
console.info( console.info(
"\t" + tzDate.toISOString(), "\t" + tzDate.toISOString(),
"// same as", "// same as",
@ -33,9 +33,9 @@ var XTZ;
console.info(); console.info();
console.info("\t// during standard time"); console.info("\t// during standard time");
console.info(`\tXTZ.fromTimeZone("2021-11-07 08:15:59.000", "America/New_York")`); console.info(`\tXTZ.toUTC("2021-11-07 08:15:59.000", "America/New_York")`);
console.info(`\ttzDate.toISOString()`); console.info(`\ttzDate.toISOString()`);
tzDate = XTZ.fromTimeZone("2021-11-07 08:15:59.000", "America/New_York"); tzDate = XTZ.toUTC("2021-11-07 08:15:59.000", "America/New_York");
console.info( console.info(
"\t" + tzDate.toISOString(), "\t" + tzDate.toISOString(),
"// same as", "// same as",
@ -65,9 +65,9 @@ var XTZ;
console.info(); console.info();
console.info("\t// during standard time"); console.info("\t// during standard time");
console.info(`\tXTZ.fromTimeZone("2021-11-07T08:15:59.000Z", "America/New_York")`); console.info(`\tXTZ.toUTC("2021-11-07T08:15:59.000Z", "America/New_York")`);
console.info(`\ttzDate.toISOString()`); console.info(`\ttzDate.toISOString()`);
tzDate = XTZ.fromTimeZone("2021-11-07T08:15:59.000Z", "America/New_York"); tzDate = XTZ.toUTC("2021-11-07T08:15:59.000Z", "America/New_York");
console.info( console.info(
"\t" + tzDate.toISOString(), "\t" + tzDate.toISOString(),
"// same as", "// same as",

120
index.html
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@ -31,78 +31,13 @@
<br /> <br />
<span class="js-my-dt">YYYY-MM-DDThh:mm:ss.mmm+0000</span> <span class="js-my-dt">YYYY-MM-DDThh:mm:ss.mmm+0000</span>
</h3> </h3>
<pre><code>new Intl.DateTimeFormat().resolvedOptions().timeZone;</code></pre>
Current Time Zone: <span class="js-my-tz">America/XXXX</span> Current Time Zone: <span class="js-my-tz">America/XXXX</span>
<br /> <br />
<pre><code>String(((new Date()).getTimezoneOffset() / 60)).padStart(2, '0') +
String(((new Date()).getTimezoneOffset() % 60)).padStart(2, '0')</code></pre>
Current Time Offset: <span class="js-my-offset">-0000</span> Current Time Offset: <span class="js-my-offset">-0000</span>
<hr /> <hr />
<form class="js-tz2tz">
<h3>Convert Between Time Zones:</h3>
<label>
Time:
<input
class="js-dt-xtz"
type="text"
placeholder="ex: 2021-03-14 03:15:69.000"
required
/>
</label>
<br />
<label>
Input Zone:
<input
class="js-tz1-xtz"
type="text"
placeholder="ex: UTC or America/New_York"
required
/>
</label>
<br />
<label>
Output Zone:
<input
class="js-tz2-xtz"
type="text"
placeholder="ex: America/Los_Angeles or UTC"
required
/>
</label>
<br />
<label>
ISO:
<input class="js-my-dt-xtz" type="text" disabled />
</label>
<br />
<br />
<button type="submit">Convert between Zones!</button>
<br />
</form>
<hr />
<form class="js-local">
<h3>Local ISO+Offset String:</h3>
<pre><code>XTZ.toLocalISOString(new Date())</code></pre>
<label>
ISO:
<input class="js-my-dt-local" type="text" disabled />
</label>
<br />
</form>
<hr />
<form class="js-tz2utc"> <form class="js-tz2utc">
<h3>TimeZone-Relative (Local) to Absolute (ISO+Offset) String:</h3> <h3>Relative TimeZone to Absolute UTC:</h3>
<pre><code>XTZ.fromTimeZone("<span class="js-dtx-tz">YYYY-03-14 03:15:69.000</span>", "<span class="js-tzx-tz">UTC</span>")
.toISOString()
// <span class="js-myx-dt-tz"></span></code></pre>
<label> <label>
Time: Time:
<input <input
@ -115,7 +50,7 @@ String(((new Date()).getTimezoneOffset() % 60)).padStart(2, '0')</code></pre>
<br /> <br />
<label> <label>
Input Zone: Zone:
<input <input
class="js-tz-tz" class="js-tz-tz"
type="text" type="text"
@ -130,17 +65,14 @@ String(((new Date()).getTimezoneOffset() % 60)).padStart(2, '0')</code></pre>
</label> </label>
<br /> <br />
<br /> <br />
<button type="submit">Convert to ISO+Offset!</button> <button type="submit">Convert to UTC!</button>
<br /> <br />
</form> </form>
<hr /> <hr />
<form class="js-utc2tz"> <form class="js-utc2tz">
<h3>Absolute (UTC) to TimeZone-Relative (ISO+Offset) String:</h3> <h3>Absolute UTC to Relative TimeZone</h3>
<pre><code>XTZ.toTimeZone("<span class="js-dtx-utc">YYYY-03-14 03:15:69.000</span>", "<span class="js-tzx-utc">UTC</span>")
.toISOString()
// <span class="js-myx-dt-utc"></span></code></pre>
<label> <label>
Time: Time:
<input <input
@ -152,7 +84,7 @@ String(((new Date()).getTimezoneOffset() % 60)).padStart(2, '0')</code></pre>
</label> </label>
<br /> <br />
<label> <label>
Output Zone: Zone:
<input <input
class="js-tz-utc" class="js-tz-utc"
type="text" type="text"
@ -194,59 +126,29 @@ Asia/Kolkata +0530 (No DST) (30-min)</pre
>github.com/therootcompany/tz.js</a >github.com/therootcompany/tz.js</a
> >
<script src="./xtz.js"></script> <script src="./xtz.js"></script>
<script src="./tolocalisostring.js"></script>
<script> <script>
function $(sel, el) { function $(sel, el) {
return (el || document.body).querySelector(sel); return (el || document.body).querySelector(sel);
} }
function translate(dt, tz, tz2) { function toUTC() {
var utc = new Date(XTZ.fromTimeZone(dt, tz).toISOString());
if (!tz2) {
return utc;
}
return XTZ.toTimeZone(utc, tz2);
}
function fromTimeZone() {
var curDt = $(".js-dt-tz").value; var curDt = $(".js-dt-tz").value;
var curTz = $(".js-tz-tz").value; var curTz = $(".js-tz-tz").value;
$(".js-my-dt-tz").value = XTZ.fromTimeZone(curDt, curTz).toISOString(); $(".js-my-dt-tz").value = XTZ.toUTC(curDt, curTz).toISOString();
$(".js-dtx-tz").innerText = curDt;
$(".js-tzx-tz").innerText = curTz;
$(".js-myx-dt-tz").innerText = $(".js-my-dt-tz").value;
} }
function toTZ() { function toTZ() {
var curDt = $(".js-dt-utc").value; var curDt = $(".js-dt-utc").value;
var curTz = $(".js-tz-utc").value; var curTz = $(".js-tz-utc").value;
$(".js-my-dt-utc").value = XTZ.toTimeZone(curDt, curTz).toISOString(); $(".js-my-dt-utc").value = XTZ.toTimeZone(curDt, curTz).toISOString();
$(".js-dtx-utc").innerText = curDt;
$(".js-tzx-utc").innerText = curTz;
$(".js-myx-dt-utc").innerText = $(".js-my-dt-utc").value;
} }
function xTZ() {
var curDt = $(".js-dt-xtz").value;
var inTz = $(".js-tz1-xtz").value;
var outTz = $(".js-tz2-xtz").value;
$(".js-my-dt-xtz").value = translate(curDt, inTz, outTz).toISOString();
}
$(".js-my-dt-local").value = XTZ.toLocalISOString();
var myTz = new Intl.DateTimeFormat("default", {}).resolvedOptions() var myTz = new Intl.DateTimeFormat("default", {}).resolvedOptions()
.timeZone; .timeZone;
$(".js-my-tz").innerText = myTz; $(".js-my-tz").innerText = myTz;
$(".js-tz-tz").value = myTz; $(".js-tz-tz").value = myTz;
$(".js-tz-utc").value = myTz; $(".js-tz-utc").value = myTz;
$(".js-tz1-xtz").value = myTz; $(".js-my-offset").innerText = -1 * new Date().getTimezoneOffset();
$(".js-tz2-xtz").value = "Asia/Kathmandu";
var myOffset = -1 * new Date().getTimezoneOffset();
$(".js-my-offset").innerText =
XTZ.formatOffset(myOffset) + " (" + myOffset + ")";
var myDate = new Date(); var myDate = new Date();
$(".js-my-dt").innerText = XTZ.toTimeZone(myDate, myTz).toISOString(); $(".js-my-dt").innerText = XTZ.toTimeZone(myDate, myTz).toISOString();
@ -254,7 +156,6 @@ Asia/Kolkata +0530 (No DST) (30-min)</pre
.toISOString() .toISOString()
.replace("T", " ") .replace("T", " ")
.replace(/(Z|(\+|-)\d+)$/, ""); .replace(/(Z|(\+|-)\d+)$/, "");
$(".js-dt-xtz").value = $(".js-dt-tz").value;
$(".js-dt-utc").value = myDate.toISOString(); $(".js-dt-utc").value = myDate.toISOString();
$("form.js-utc2tz").addEventListener("submit", function (ev) { $("form.js-utc2tz").addEventListener("submit", function (ev) {
@ -265,12 +166,11 @@ Asia/Kolkata +0530 (No DST) (30-min)</pre
$("form.js-tz2utc").addEventListener("submit", function (ev) { $("form.js-tz2utc").addEventListener("submit", function (ev) {
ev.preventDefault(); ev.preventDefault();
ev.stopPropagation(); ev.stopPropagation();
fromTimeZone(); toUTC();
}); });
fromTimeZone(); toUTC();
toTZ(); toTZ();
xTZ();
</script> </script>
</body> </body>
</html> </html>

6
package.json
View File

@ -1,12 +1,8 @@
{ {
"name": "xtz", "name": "xtz",
"version": "1.3.2", "version": "1.0.2",
"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.", "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", "main": "xtz.js",
"files": [
"xtz.js",
"tolocalisostring.js"
],
"scripts": { "scripts": {
"test": "node ./test.js", "test": "node ./test.js",
"build": "uglifyjs ./xtz.js > ./xtz.min.js ; gzip -k -f ./xtz.min.js" "build": "uglifyjs ./xtz.js > ./xtz.min.js ; gzip -k -f ./xtz.min.js"

74
test.js
View File

@ -4,10 +4,9 @@ var TZ = require("./");
function testUtcToTz(t) { function testUtcToTz(t) {
var result = TZ.toTimeZone.apply(TZ, t.inputs).toISOString(); var result = TZ.toTimeZone.apply(TZ, t.inputs).toISOString();
var result2 = TZ.toTimeZoneISOString.apply(TZ, t.inputs); if (t.result !== result) {
if (result !== result2 || t.result !== result) {
throw new Error( throw new Error(
`Invalid UTC/ISO+Offset to TZ conversion for ${t.desc}:\n` + `Invalid UTC to TZ conversion for ${t.desc}:\n` +
`\tExpected: ${t.result}\n` + `\tExpected: ${t.result}\n` +
`\tActual: ${result}\n` `\tActual: ${result}\n`
); );
@ -15,11 +14,9 @@ function testUtcToTz(t) {
} }
function testTzToUtc(t) { function testTzToUtc(t) {
var result = TZ.fromTimeZone.apply(TZ, t.inputs).toISOString(); var result = TZ.toUTC.apply(TZ, t.inputs);
var result2 = TZ.toOffsetISOString.apply(TZ, t.inputs); if (t.result !== result.toISOString()) {
var result3 = TZ.toUTC.apply(TZ, t.inputs).toISOString(); console.log(result);
if (t.result !== result || t.result !== result2 || t.result !== result3) {
console.error(result);
throw new Error( throw new Error(
`Invalid TZ to UTC conversion for ${t.desc}:\n` + `Invalid TZ to UTC conversion for ${t.desc}:\n` +
`\tExpected: ${t.result}\n` + `\tExpected: ${t.result}\n` +
@ -47,23 +44,23 @@ function testTzToUtc(t) {
// 12:15am NY -0500 => -0400 // 12:15am NY -0500 => -0400
{ {
desc: "UTC Zulu to 12:15am NY EST", desc: "UTC to 12:15am NY EST",
inputs: ["2021-03-14T05:15:59.000Z", "America/New_York"], inputs: ["2021-03-14T05:15:59.000Z", "America/New_York"],
result: "2021-03-14T00:15:59.000-0500", result: "2021-03-14T00:15:59.000-0500",
}, },
{ {
desc: "ISO+Offset to 12:15am NY EST (2)", desc: "UTC to 12:15am NY EST (2)",
inputs: ["2021-03-14T00:15:59.000-0500", "America/New_York"], inputs: ["2021-03-14T00:15:59.000-0500", "America/New_York"],
result: "2021-03-14T00:15:59.000-0500", result: "2021-03-14T00:15:59.000-0500",
}, },
// 1:15am NY (non-DST) // 1:15am NY (non-DST)
{ {
desc: "UTC Zulu to 1:15am NY EST", desc: "UTC to 1:15am NY EST",
inputs: ["2021-03-14T06:15:59.000Z", "America/New_York"], inputs: ["2021-03-14T06:15:59.000Z", "America/New_York"],
result: "2021-03-14T01:15:59.000-0500", result: "2021-03-14T01:15:59.000-0500",
}, },
{ {
desc: "ISO+Offset to 1:15am NY EST (2)", desc: "UTC to 1:15am NY EST (2)",
inputs: ["2021-03-14T01:15:59.000-0500", "America/New_York"], inputs: ["2021-03-14T01:15:59.000-0500", "America/New_York"],
result: "2021-03-14T01:15:59.000-0500", result: "2021-03-14T01:15:59.000-0500",
}, },
@ -72,23 +69,23 @@ function testTzToUtc(t) {
// 3:15am NY (DST) // 3:15am NY (DST)
{ {
desc: "UTC Zulu to 3:15am NY EDT", desc: "UTC to 3:15am NY EDT",
inputs: ["2021-03-14T07:15:59.000Z", "America/New_York"], inputs: ["2021-03-14T07:15:59.000Z", "America/New_York"],
result: "2021-03-14T03:15:59.000-0400", result: "2021-03-14T03:15:59.000-0400",
}, },
{ {
desc: "ISO+Offset to 3:15am NY EDT (2)", desc: "UTC to 3:15am NY EDT (2)",
inputs: ["2021-03-14T03:15:59.000-0400", "America/New_York"], inputs: ["2021-03-14T03:15:59.000-0400", "America/New_York"],
result: "2021-03-14T03:15:59.000-0400", result: "2021-03-14T03:15:59.000-0400",
}, },
// 4:15am NY // 4:15am NY
{ {
desc: "UTC Zulu to 4:15am NY EDT", desc: "UTC to 4:15am NY EDT",
inputs: ["2021-03-14T08:15:59.000Z", "America/New_York"], inputs: ["2021-03-14T08:15:59.000Z", "America/New_York"],
result: "2021-03-14T04:15:59.000-0400", result: "2021-03-14T04:15:59.000-0400",
}, },
{ {
desc: "ISO+Offset to 4:15am NY EDT (2)", desc: "UTC to 4:15am NY EDT (2)",
inputs: ["2021-03-14T04:15:59.000-0400", "America/New_York"], inputs: ["2021-03-14T04:15:59.000-0400", "America/New_York"],
result: "2021-03-14T04:15:59.000-0400", result: "2021-03-14T04:15:59.000-0400",
}, },
@ -109,57 +106,57 @@ function testTzToUtc(t) {
// 12:15am NY -0400 => -0500 // 12:15am NY -0400 => -0500
{ {
desc: "UTC Zulu to 2021 Nov 7, 12:15am NY EDT", desc: "UTC to 2021 Nov 7, 12:15am NY EDT",
inputs: ["2021-11-07T04:15:59.000Z", "America/New_York"], inputs: ["2021-11-07T04:15:59.000Z", "America/New_York"],
result: "2021-11-07T00:15:59.000-0400", result: "2021-11-07T00:15:59.000-0400",
}, },
{ {
desc: "ISO+Offset to 2021 Nov 7, 12:15am NY EDT (2)", desc: "UTC to 2021 Nov 7, 12:15am NY EDT (2)",
inputs: ["2021-11-07T00:15:59.000-0400", "America/New_York"], inputs: ["2021-11-07T00:15:59.000-0400", "America/New_York"],
result: "2021-11-07T00:15:59.000-0400", result: "2021-11-07T00:15:59.000-0400",
}, },
// 1:15am NY (DST) -0400 // 1:15am NY (DST) -0400
// NOTE: 1:15am happens TWICE (with different offsets) // NOTE: 1:15am happens TWICE (with different offsets)
{ {
desc: "UTC Zulu to 2021 Nov 7, 1:15am NY EDT", desc: "UTC to 2021 Nov 7, 1:15am NY EDT",
inputs: ["2021-11-07T05:15:59.000Z", "America/New_York"], inputs: ["2021-11-07T05:15:59.000Z", "America/New_York"],
result: "2021-11-07T01:15:59.000-0400", result: "2021-11-07T01:15:59.000-0400",
}, },
{ {
desc: "ISO+Offset to 2021 Nov 7, 1:15am NY EDT (2)", desc: "UTC to 2021 Nov 7, 1:15am NY EDT (2)",
inputs: ["2021-11-07T01:15:59.000-0400", "America/New_York"], inputs: ["2021-11-07T01:15:59.000-0400", "America/New_York"],
result: "2021-11-07T01:15:59.000-0400", result: "2021-11-07T01:15:59.000-0400",
}, },
// 1:15am NY (non-DST) -0500 // 1:15am NY (non-DST) -0500
{ {
desc: "UTC Zulu to 2021 Nov 7, 1:15am NY EST", desc: "UTC to 2021 Nov 7, 1:15am NY EST",
inputs: ["2021-11-07T06:15:59.000Z", "America/New_York"], inputs: ["2021-11-07T06:15:59.000Z", "America/New_York"],
result: "2021-11-07T01:15:59.000-0500", result: "2021-11-07T01:15:59.000-0500",
}, },
{ {
desc: "ISO+Offset to 2021 Nov 7, 1:15am NY EST (2)", desc: "UTC to 2021 Nov 7, 1:15am NY EST (2)",
inputs: ["2021-11-07T01:15:59.000-0500", "America/New_York"], inputs: ["2021-11-07T01:15:59.000-0500", "America/New_York"],
result: "2021-11-07T01:15:59.000-0500", result: "2021-11-07T01:15:59.000-0500",
}, },
// 2:15am NY -0500 // 2:15am NY -0500
{ {
desc: "UTC Zulu to 2021 Nov 7, 2:15am NY EST", desc: "UTC to 2021 Nov 7, 2:15am NY EST",
inputs: ["2021-11-07T07:15:59.000Z", "America/New_York"], inputs: ["2021-11-07T07:15:59.000Z", "America/New_York"],
result: "2021-11-07T02:15:59.000-0500", result: "2021-11-07T02:15:59.000-0500",
}, },
{ {
desc: "ISO+Offset to 2021 Nov 7, 2:15am NY EST (2)", desc: "UTC to 2021 Nov 7, 2:15am NY EST (2)",
inputs: ["2021-11-07T02:15:59.000-0500", "America/New_York"], inputs: ["2021-11-07T02:15:59.000-0500", "America/New_York"],
result: "2021-11-07T02:15:59.000-0500", result: "2021-11-07T02:15:59.000-0500",
}, },
// 3:15am NY // 3:15am NY
{ {
desc: "UTC Zulu to 2021 Nov 7, 3:15am NY EST", desc: "UTC to 2021 Nov 7, 3:15am NY EST",
inputs: ["2021-11-07T08:15:59.000Z", "America/New_York"], inputs: ["2021-11-07T08:15:59.000Z", "America/New_York"],
result: "2021-11-07T03:15:59.000-0500", result: "2021-11-07T03:15:59.000-0500",
}, },
{ {
desc: "ISO+Offset to 2021 Nov 7, 3:15am NY EST (2)", desc: "UTC to 2021 Nov 7, 3:15am NY EST (2)",
inputs: ["2021-11-07T03:15:59.000-0500", "America/New_York"], inputs: ["2021-11-07T03:15:59.000-0500", "America/New_York"],
result: "2021-11-07T03:15:59.000-0500", result: "2021-11-07T03:15:59.000-0500",
}, },
@ -170,29 +167,27 @@ function testTzToUtc(t) {
// Colombo +0530 (not DST) // Colombo +0530 (not DST)
{ {
desc: "UTC Zulu to Asia/Colombo (1)", desc: "UTC to Asia/Colombo (1)",
inputs: ["2021-03-14T08:15:59.000Z", "Asia/Colombo"], inputs: ["2021-03-14T08:15:59.000Z", "Asia/Colombo"],
result: "2021-03-14T13:45:59.000+0530", result: "2021-03-14T13:45:59.000+0530",
}, },
{ {
desc: "ISO+Offset to Asia/Colombo (2)", desc: "UTC to Asia/Colombo (2)",
inputs: ["2021-03-14T13:45:59.000+0530", "Asia/Colombo"], inputs: ["2021-03-14T13:45:59.000+0530", "Asia/Colombo"],
result: "2021-03-14T13:45:59.000+0530", result: "2021-03-14T13:45:59.000+0530",
}, },
{ {
desc: "UTC Zulu to Asia/Colombo (3)", desc: "UTC to Asia/Colombo (3)",
inputs: ["2021-11-07T08:15:59.000Z", "Asia/Colombo"], inputs: ["2021-11-07T08:15:59.000Z", "Asia/Colombo"],
result: "2021-11-07T13:45:59.000+0530", result: "2021-11-07T13:45:59.000+0530",
}, },
{ {
desc: "ISO+Offset to Asia/Colombo (4)", desc: "UTC to Asia/Colombo (4)",
inputs: ["2021-11-07T13:45:59.000+0530", "Asia/Colombo"], inputs: ["2021-11-07T13:45:59.000+0530", "Asia/Colombo"],
result: "2021-11-07T13:45:59.000+0530", result: "2021-11-07T13:45:59.000+0530",
}, },
].forEach(testUtcToTz); ].forEach(testUtcToTz);
console.info( console.info("Pass: UTC to TZ for America/New_York and Asia/Colombo");
"Pass: UTC/ISO+Offset to TZ for America/New_York and Asia/Colombo"
);
[ [
// //
@ -319,16 +314,3 @@ console.info(
}, },
].forEach(testTzToUtc); ].forEach(testTzToUtc);
console.info("Pass: TZ to UTC for America/New_York and Asia/Colombo"); console.info("Pass: TZ to UTC for America/New_York and Asia/Colombo");
var localISOString = TZ.toLocalISOString();
var reISOString = /^\d\d\d\d-\d\d-\d\dT\d\d:\d\d:\d\d\.\d\d\d[+-]\d\d\d\d$/;
if (!reISOString.test(localISOString)) {
throw new Error("Couldn't get local time as iso+offset");
}
console.info("Pass: can get local time as ISO+Offset");
var tzName = TZ.timeZone();
if (!/^[A-Z]\w+\/[A-Z]\w+$/.test(tzName)) {
throw new Error("Couldn't get local Time Zone");
}
console.info("Pass: can get local timezone");

50
tolocalisostring.js
View File

@ -1,50 +0,0 @@
(function (exports) {
"use strict";
// See <https://github.com/coolaj86/AJScript/issues/27>
function toLocalISOString(dateOrStr) {
var d;
if (dateOrStr) {
d = new Date(dateOrStr);
} else {
d = new Date();
}
var YYYY = d.getFullYear();
var MM = p2(d.getMonth() + 1);
var DD = p2(d.getDate());
var hh = p2(d.getHours());
var mm = p2(d.getMinutes());
var ss = p2(d.getSeconds());
var sss = d.getMilliseconds().toString().padStart(3, "0");
var offset = formatOffset(-d.getTimezoneOffset());
return `${YYYY}-${MM}-${DD}T${hh}:${mm}:${ss}.${sss}${offset}`;
}
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 + p2(h) + p2(m);
}
function p2(x) {
return String(x).padStart(2, "0");
}
exports.toLocalISOString = toLocalISOString;
})(("undefined" === typeof module && window) || exports);

70
xtz.js
View File

@ -1,4 +1,6 @@
(function (exports) { var XTZ;
(function () {
"use strict"; "use strict";
function toTimeZone(date, timeZone) { function toTimeZone(date, timeZone) {
@ -60,16 +62,15 @@
function toTimeZoneISOString(date, timeZone) { function toTimeZoneISOString(date, timeZone) {
var whole = toTimeZone(date, timeZone); var whole = toTimeZone(date, timeZone);
return formatAsOffsetISOString(whole); return toOffsetISOString(whole);
} }
function _toOffsetISOString() { function _toOffsetISOString() {
/* jshint validthis: true */ return toOffsetISOString(this);
return formatAsOffsetISOString(this);
} }
function getOffset(utcDate, tzD2) { function getOffset(utcDate, tzD2) {
var tzDate = new Date(formatAsOffsetISOString(tzD2)); var tzDate = new Date(toOffsetISOString(tzD2));
var diff = Math.round((tzDate.valueOf() - utcDate.valueOf()) / (60 * 1000)); var diff = Math.round((tzDate.valueOf() - utcDate.valueOf()) / (60 * 1000));
return diff; return diff;
} }
@ -102,16 +103,7 @@
); );
} }
function toOffsetISOString(date, timeZone) { function toOffsetISOString(d) {
if ("object" === typeof date && "offset" in date && "year" in date) {
return formatAsOffsetISOString(date);
}
var whole = fromTimeZone(date, timeZone);
return formatAsOffsetISOString(whole);
}
function formatAsOffsetISOString(d) {
var offset = formatOffset(d.offset); var offset = formatOffset(d.offset);
return ( return (
`${d.year}-${p2(d.month + 1)}-${p2(d.day)}` + `${d.year}-${p2(d.month + 1)}-${p2(d.day)}` +
@ -121,7 +113,7 @@
); );
} }
function fromTimeZone(dt, tz) { function toUTC(dt, tz) {
if ("string" === typeof dt) { if ("string" === typeof dt) {
// Either of these formats should work: // Either of these formats should work:
// 2021-03-14 01:15:59 // 2021-03-14 01:15:59
@ -158,47 +150,19 @@
return tzD3; return tzD3;
} }
function toLocalISOString(dateOrStr) { function toUTCISOString(date, timeZone) {
var d; var whole = toUTC(date, timeZone);
if (dateOrStr) { return toOffsetISOString(whole);
d = new Date(dateOrStr);
} else {
d = new Date();
}
var YYYY = d.getFullYear();
var MM = p2(d.getMonth() + 1);
var DD = p2(d.getDate());
var hh = p2(d.getHours());
var mm = p2(d.getMinutes());
var ss = p2(d.getSeconds());
var sss = d.getMilliseconds().toString().padStart(3, "0");
var offset = formatOffset(-d.getTimezoneOffset());
return `${YYYY}-${MM}-${DD}T${hh}:${mm}:${ss}.${sss}${offset}`;
} }
function getTimeZone() { XTZ = {
return new Intl.DateTimeFormat().resolvedOptions().timeZone;
}
exports.XTZ = {
// bespoke date => // bespoke date =>
// 2021-11-07T3:15:59-0500 // 2021-11-07T3:15:59-0500
// (todo?)
// xtzToISOString: formatAsOffsetISOString,
// (deprecated)
toOffsetISOString: toOffsetISOString, toOffsetISOString: toOffsetISOString,
// -240 => -0400 // -240 => -0400
formatOffset: formatOffset, formatOffset: formatOffset,
// "America/New_York"
timeZone: getTimeZone,
// "2021-11-07T03:15:59-0500"
toLocalISOString: toLocalISOString,
// [ "2021-11-07T08:15:59Z", "America/New_York" ] // [ "2021-11-07T08:15:59Z", "America/New_York" ]
// => "2021-11-07T03:15:59-0500" // 2021-11-07 03:15:59 // => "2021-11-07T03:15:59-0500" // 2021-11-07 03:15:59
toTimeZone: toTimeZone, toTimeZone: toTimeZone,
@ -206,13 +170,11 @@
// [ "2021-11-07 03:15:59", "America/New_York" ] // [ "2021-11-07 03:15:59", "America/New_York" ]
// => "2021-11-07T03:15:59-0500" // 2021-11-07T08:15:59Z // => "2021-11-07T03:15:59-0500" // 2021-11-07T08:15:59Z
toUTC: fromTimeZone, toUTC: toUTC,
fromTimeZone: fromTimeZone, toUTCISOString: toUTCISOString,
// deprecated
toUTCISOString: toOffsetISOString,
}; };
if ("undefined" != typeof module && module.exports) { if ("undefined" != typeof module && module.exports) {
module.exports = exports.XTZ; module.exports = XTZ;
} }
})(("undefined" === typeof module && window) || exports); })();