cedel1/dmDateTimePickerPlugin — comment on commit 46e8d4217af9be58bd4df6deed3fda1e56b72a99
File:  line 0
By cedel1:

The comit message says it almost all. It has the advantage of keeping the automatic .required css class for required fields and .has_error css class for fields that didn't validate (for example, neiing empty).

Symfony widget sfWidgetFormDateTime seems to have small error in not rendering these, albeit the fix seems to be simple. This commit includes the code even for this widget (in case it gets fixed), and it breaks nothing in case it won't be fixed.