6 calls to date_is_date() in Date 7.2

date_combo_validate in ./date_elements.inc

Validate and update a combo element.

date_popup_element_value_callback in date_popup/date_popup.module

Element value callback for date_popup element.

date_popup_process_date_part in date_popup/date_popup.module

Process the date portion of the element.

date_select_element_value_callback in date_api/date_api_elements.inc

Element value callback for date_select element.

date_text_element_value_callback in date_api/date_api_elements.inc

Element value callback for date_text element.

date_views_filter_handler_simple::input_validate in date_views/includes/date_views_filter_handler_simple.inc

Return form state input array appropriate to missing, valid, invalid input.