PHP's checkdate in TypeScript

How to use

Install via yarn add locutus and import: import { checkdate } from 'locutus/php/datetime/checkdate'.

Or with CommonJS: const { checkdate } = require('locutus/php/datetime/checkdate')

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	checkdate(12, 31, 2000)	true
2	checkdate(2, 29, 2001)	false
3	checkdate(3, 31, 2008)	true
4	checkdate(1, 390, 2000)	false

Here's what our current TypeScript equivalent to PHP's checkdate looks like.

TSTypeScript JSJavaScript TSStandalone TS JSStandalone JS

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export function checkdate(m: number, d: number, y: number): boolean {
  //      discuss at: https://locutus.io/php/checkdate/
  // parity verified: PHP 8.3
  //     original by: Kevin van Zonneveld (https://kvz.io)
  //     improved by: Pyerre
  //     improved by: Theriault (https://github.com/Theriault)
  //       example 1: checkdate(12, 31, 2000)
  //       returns 1: true
  //       example 2: checkdate(2, 29, 2001)
  //       returns 2: false
  //       example 3: checkdate(3, 31, 2008)
  //       returns 3: true
  //       example 4: checkdate(1, 390, 2000)
  //       returns 4: false

  return m > 0 && m < 13 && y > 0 && y < 32768 && d > 0 && d <= new Date(y, m, 0).getDate()
}

export function checkdate(m, d, y) {
  //      discuss at: https://locutus.io/php/checkdate/
  // parity verified: PHP 8.3
  //     original by: Kevin van Zonneveld (https://kvz.io)
  //     improved by: Pyerre
  //     improved by: Theriault (https://github.com/Theriault)
  //       example 1: checkdate(12, 31, 2000)
  //       returns 1: true
  //       example 2: checkdate(2, 29, 2001)
  //       returns 2: false
  //       example 3: checkdate(3, 31, 2008)
  //       returns 3: true
  //       example 4: checkdate(1, 390, 2000)
  //       returns 4: false

  return m > 0 && m < 13 && y > 0 && y < 32768 && d > 0 && d <= new Date(y, m, 0).getDate()
}

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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