Go's time.UnixMilli in TypeScript

How to use

Install via yarn add locutus and import: import { UnixMilli } from 'locutus/golang/time/UnixMilli'.

Or with CommonJS: const { UnixMilli } = require('locutus/golang/time/UnixMilli')

Use a bundler that supports tree-shaking so you only ship the functions you actually use. Vite, webpack, Rollup, and Parcel all handle this. For server-side use this is less of a concern.

Examples

These examples are extracted from test cases that automatically verify our functions against their native counterparts.

#	code	expected result
1	UnixMilli(0).toISOString()	'1970-01-01T00:00:00.000Z'
2	UnixMilli(1700000000123).toISOString()	'2023-11-14T22:13:20.123Z'
3	UnixMilli(-1).toISOString()	'1969-12-31T23:59:59.999Z'

Notes

• Returns a JavaScript Date for milliseconds since Unix epoch.

Here's what our current TypeScript equivalent to Go's time.UnixMilli looks like.

TSTypeScript JSJavaScript TSStandalone TS JSStandalone JS

Copy code

export function UnixMilli(msec: number): Date {
  //      discuss at: https://locutus.io/golang/time/UnixMilli
  // parity verified: Go 1.23
  //     original by: Kevin van Zonneveld (https://kvz.io)
  //          note 1: Returns a JavaScript Date for milliseconds since Unix epoch.
  //       example 1: UnixMilli(0).toISOString()
  //       returns 1: '1970-01-01T00:00:00.000Z'
  //       example 2: UnixMilli(1700000000123).toISOString()
  //       returns 2: '2023-11-14T22:13:20.123Z'
  //       example 3: UnixMilli(-1).toISOString()
  //       returns 3: '1969-12-31T23:59:59.999Z'

  const millis = Math.trunc(Number(msec))
  if (!Number.isFinite(millis)) {
    throw new TypeError('UnixMilli(): invalid timestamp')
  }

  return new Date(millis)
}

export function UnixMilli(msec) {
  //      discuss at: https://locutus.io/golang/time/UnixMilli
  // parity verified: Go 1.23
  //     original by: Kevin van Zonneveld (https://kvz.io)
  //          note 1: Returns a JavaScript Date for milliseconds since Unix epoch.
  //       example 1: UnixMilli(0).toISOString()
  //       returns 1: '1970-01-01T00:00:00.000Z'
  //       example 2: UnixMilli(1700000000123).toISOString()
  //       returns 2: '2023-11-14T22:13:20.123Z'
  //       example 3: UnixMilli(-1).toISOString()
  //       returns 3: '1969-12-31T23:59:59.999Z'

  const millis = Math.trunc(Number(msec))
  if (!Number.isFinite(millis)) {
    throw new TypeError('UnixMilli(): invalid timestamp')
  }

  return new Date(millis)
}

Improve this function

Locutus is a community effort following The McDonald's Theory: we ship first iterations, hoping others will improve them. If you see something that could be better, we'd love your contribution.

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