Check if a string is a valid date with a given format

[loota]

It would be very useful to be able to check if a string is a valid date. It is a very common use case to get a date string from a form or from an external service.

Example from moment.js: moment('29.2.2013', 'DD.MM.YYYY').isValid()

Code which I believe moment.js uses for this:
https://github.com/moment/moment/blob/c587bf0063c18214238ca83f3f9c6170daf25bed/src/lib/create/from-string.js

[fightbulc]

Howdy. Will take a look.

[loota]

Respect\Validation also validates this:

validate('30.6.2015'), //true v::date('d.m.Y')->validate('31.6.2015'), //false v::date('d.m.Y')->validate('29.2.2015'), //false v::date('d.m.Y')->validate('29.2.2016') //true ); ?>

The code seems to be here: https://github.com/Respect/Validation/blob/master/library/Rules/Date.php

[RuslanMelnychenko]

The function isValidDate is there, but it is private, you can make it public.
https://github.com/fightbulc/moment.php/blob/master/src/Moment.php#L1306-L1406