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tz.js
mirror of https://github.com/therootcompany/tz.js
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A fast, lightweight, zero-dependency library to translate between Time Zones and UTC with native Intl.DateTimeFormat in ~100 LoC.
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tz.js/test.js

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"use strict";
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`
);
}
}
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`
);
}
}
// At this real UTC time, what does the timezone translate it to?
[
//
// 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]
// 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)
// 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
//
// [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",
},
//
// 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",
},
].forEach(testUtcToTz);
console.info("Pass: UTC to TZ for America/New_York and Asia/Colombo");
[
//
// 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]
// 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
},
// 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
//
// [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",
},
// 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",
},
//
// 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",
},
].forEach(testTzToUtc);
console.info("Pass: TZ to UTC for America/New_York and Asia/Colombo");