Remove duplicate date parsing in Post_Command.php #693

Job	Run time
code-quality / Lint PHP files	16s
code-quality / Lint Gherkin Feature files	13s
code-quality / Spell check	8s
code-quality / PHPCS	22s
code-quality / PHPStan	31s
code-quality / Lint GitHub Actions workflows	7s
	1m 37s

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