Convert date package to TypeScript #121091

Job	Run time
Build JavaScript assets for PHP unit tests	2m 1s
Compute previous WordPress version	1s
Mobile	2m 4s
PHP coding standards	20s
JavaScript (Node.js 20) 1/4	2m 1s
JavaScript Date Tests (Node.js 20)	50s
JavaScript (Node.js 20) 2/4	2m 2s
JavaScript Date Tests (Node.js 22)	52s
JavaScript (Node.js 20) 3/4	1m 52s
JavaScript (Node.js 20) 4/4	1m 51s
JavaScript (Node.js 22) 1/4	1m 59s
JavaScript (Node.js 22) 2/4	2m 3s
JavaScript (Node.js 22) 3/4	1m 51s
JavaScript (Node.js 22) 4/4	1m 46s
PHP ${{ matrix.php }}${{ ((matrix.multisite && ' multisite') \|\| '') }}${{ (((matrix.wordpress != '') && format(' (WP {0}) ', matrix.wordpress)) \|\| '') }} on ubuntu-latest	1s
PHP	1s
	21m 35s

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