8 calls to date_is_valid() in Date 5
- date_array2iso in ./
date.inc - Date conversion functions
- date_array2unix in ./
date.inc - date_field in ./
date.module - Implementation of hook_field().
- date_iso2array in ./
date.inc - date_iso2unix in ./
date.inc - date_unix2array in ./
date.inc - date_unix2iso in ./
date.inc - _date_views_filter_handler in ./
date_views.inc