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These quarters may then be subdivided into 5 + 4 + 4 weeks, 4 + 5 + 4 weeks or 4 + 4 + 5 weeks. The final quarter has 14 weeks in it when there are 53 weeks in the year. When it is necessary to allocate a week to a single month, the rule for first week of the year might be applied, although ISO 8601-1 does not consider this case explicitly.
The second trimester is defined as starting, between the beginning of week 13 (12 weeks +0 days of GA) [4] and beginning of week 15 (14 weeks + 0 days of GA). [37] It ends at the end of week 27 (26 weeks + 6 days of GA) [ 37 ] or end of week 28 (27 weeks + 6 days of GA).