date_default_value in core/modules/date/date.elements.inc

The callback for setting a default value for an empty date field.

date_default_value_part in core/modules/date/date.elements.inc

Helper function for the date default value callback to set either 'value' or 'value2' to its default value.

date_field_load in core/modules/date/date.field.inc

Implements hook_field_load().

date_field_presave in core/modules/date/date.field.inc

Implements hook_field_insert().

date_formatter_process in core/modules/date/date.module

Helper function for creating formatted date arrays from a formatter.

date_views_argument_handler::get_query_fields in core/modules/date/views/date_views_argument_handler.inc

Collect information about our fields we will need to create the right query.

date_views_argument_handler_simple::init in core/modules/date/views/date_views_argument_handler_simple.inc

Get granularity.

date_views_filter_handler::get_query_fields in core/modules/date/views/date_views_filter_handler.inc

date_views_filter_handler_simple::init in core/modules/date/views/date_views_filter_handler_simple.inc

Provide some extra help to get the operator/value easier to use.

_date_default_field_widget_form in core/modules/date/date.elements.inc

Helper for the default widget form.

_date_html5_field_widget_form in core/modules/date/date.elements.inc

Helper for the HTML5 widget form.