laravel/laravel — pull request #1192 by franzliedke (2012-09-07 12:07:08+00:00)
Title: Date format validation rule

This allows for validating a PHP [date format](http://php.net/manual/en/datetime.createfromformat.php#refsect1-datetime.createfromformat-parameters).

Rules would look like this:

'start_time' => 'date_format:H\\:i',

Note the backslash escaping the colon so that it does not count as parameter separator.

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Everything documented and properly unit-tested.