Action: wu_transition_discount_code_date_start

Fires when the date start of a discount code transitions from one value to another.

This hook is fired by BerlinDB when a database UPDATE changes the date_start column for a discount code row.

Parameters

Name	Type	Description
$old_value	`string`	The previous date start value.
$new_value	`string`	The new date start value.
$item_id	`int`	The discount code ID.