The manufacturing calendar defines a thirteen-period year and a 7-day week. The periods are grouped into three quarters of three periods each and one quarter of four periods. With a 53-week year, one period includes an extra week.
When you define the thirteen periods, you specify which quarter includes the extra period. If the year includes 53 weeks, you specify which period includes the extra week. If you specify the date on which the year starts, you must indicate whether the year has 53 or 52 weeks. A calendar of 52 weeks is first grouped into 53 weeks and then adjusted to 52 weeks.