This package is part of the Apie library. The code is maintained in a monorepo, so PR's need to be sent to the monorepo
This package converts PHP date format strings into regular expressions. Right now it will create the 'simple' regular expression. So it will validate 30 february as a valid date.
<?php
use Apie\DateformatToRegex\DateFormatToRegex;
$dateFormat = DateTime::ATOM;
$regularExpression = DateFormatToRegex::formatToRegex($dateFormat);
$dateString = '2020-01-28T16:22:37-07:00';
// echos 1 as the regular expression matches the date string.
var_dump(preg_match($regularExpression, $dateString));