Week Interval for Sunday-based weeks in Coordinated Universal Time (UTC) (e.g., February 5, 2012 at 12:00 AM). 7 days and 168 hours.
Optional
Week Interval for Sunday-based weeks in Coordinated Universal Time (UTC) (e.g., February 5, 2012 at 12:00 AM). 7 days and 168 hours.