Go's time.Unix in TypeScript

How to use

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

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

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	Unix(0, 0).toISOString()	'1970-01-01T00:00:00.000Z'
2	Unix(1700000000, 0).toISOString()	'2023-11-14T22:13:20.000Z'
3	Unix(1700000000, 500000000).toISOString()	'2023-11-14T22:13:20.500Z'

Notes

• Returns a JavaScript Date representing sec + nsec nanoseconds since Unix epoch.

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

TSTypeScript JSJavaScript TSStandalone TS JSStandalone JS

Copy code

export function Unix(sec: number, nsec = 0): Date {
  //      discuss at: https://locutus.io/golang/time/Unix
  // parity verified: Go 1.23
  //     original by: Kevin van Zonneveld (https://kvz.io)
  //          note 1: Returns a JavaScript Date representing sec + nsec nanoseconds since Unix epoch.
  //       example 1: Unix(0, 0).toISOString()
  //       returns 1: '1970-01-01T00:00:00.000Z'
  //       example 2: Unix(1700000000, 0).toISOString()
  //       returns 2: '2023-11-14T22:13:20.000Z'
  //       example 3: Unix(1700000000, 500000000).toISOString()
  //       returns 3: '2023-11-14T22:13:20.500Z'

  const seconds = Math.trunc(Number(sec))
  const nanos = Math.trunc(Number(nsec))

  if (!Number.isFinite(seconds) || !Number.isFinite(nanos)) {
    throw new TypeError('Unix(): invalid timestamp components')
  }

  const millis = seconds * 1_000 + nanos / 1_000_000
  return new Date(millis)
}

export function Unix(sec, nsec = 0) {
  //      discuss at: https://locutus.io/golang/time/Unix
  // parity verified: Go 1.23
  //     original by: Kevin van Zonneveld (https://kvz.io)
  //          note 1: Returns a JavaScript Date representing sec + nsec nanoseconds since Unix epoch.
  //       example 1: Unix(0, 0).toISOString()
  //       returns 1: '1970-01-01T00:00:00.000Z'
  //       example 2: Unix(1700000000, 0).toISOString()
  //       returns 2: '2023-11-14T22:13:20.000Z'
  //       example 3: Unix(1700000000, 500000000).toISOString()
  //       returns 3: '2023-11-14T22:13:20.500Z'

  const seconds = Math.trunc(Number(sec))
  const nanos = Math.trunc(Number(nsec))

  if (!Number.isFinite(seconds) || !Number.isFinite(nanos)) {
    throw new TypeError('Unix(): invalid timestamp components')
  }

  const millis = seconds * 1_000 + nanos / 1_000_000
  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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