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

Process an individual date element.

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

Validate and update a combo element.

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

Javascript popup element processing.

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

Massage the input values back into a single date.

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

Flexible date/time drop-down selector.

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

Validation function for date selector.

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

Text date input form.

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

Validation for text input.

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

Creates a timezone form element.

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

Validation for timezone input.