Gets or sets the time at which the task’s schedule expires.
Assembly: Microsoft.Phone (in Microsoft.Phone.dll)
This date must be sometime after the current time, but must be 14 days or less from the current date. The default value is 14 days from the current date. Applications that use periodic tasks must renew their schedule at least once every two weeks by calling Remove(String) and then Add(ScheduledAction) to add the task when the main application is running in the foreground. This helps to ensure that unused applications are not draining device resources.
Some applications may have periodic agents for which the schedule does not expire as long as certain requirements are met. For more information, see Background agents for Windows Phone 8.