documentcloud/underscore-contrib — pull request #5 by gsamokovarov (2013-04-25 12:49:01+00:00)
Title: Add _.isValidDate and _.isInvalidDate predicates

I often need one of those in my projects. I know they've been rejected in core underscore (see [#489][U489], for example), but maybe `underscore-contrib` can be a good place for them to live in.

Whatcha you guys think?

[U489]: https://github.com/documentcloud/underscore/pull/489