date_combo_validate in core/modules/date/
Validate and update a combo element.
date_default_value in core/modules/date/
The callback for setting a default value for an empty date field.
date_field_load in core/modules/date/
Implements hook_field_load().
date_field_validate in core/modules/date/
Implements hook_field_validate().
date_formatter_process in core/modules/date/date.module
Helper function for creating formatted date arrays from a formatter.
date_prepare_entity in core/modules/date/date.module
Helper function to adapt entity date fields to formatter settings.
date_tokens in core/modules/date/
Implements hook_tokens().