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Every 28 years should have five years with 53 Saturdays if the period does not involve a century year not divisible by 400. Any year starting on Saturday has 53 Saturdays, such as 2005, 2011, 2022, and 2028 counting from 2001 to 2028. Moreover, any leap year starting on Friday has 53 Saturdays. 2016 was the leap year starting on Friday, and the next leap year starting on Friday will be 2044 (after 28 years).
A Gregorian calendar year can have 52 or 53 weeks. If you guess the leap year has 53 weeks, it is wrong. In ISO-8601, every 28 years should have five years with 53 weeks if the period does not involve a century year not divisible by 400. Any year starting on Thursday has 53 weeks, such as 2004, 2009, 2015, and 2026 counting from 2001 to 2028; any leap year starting on Wednesday has 53 weeks, such as 2020 and 2048.
No year can have its four quarters starting on the same day of the week in the Gregorian calendar. A quarter with 91 days or exactly 13 weeks has the next quarter to begin on the same day of the week. In the leap year, the first two quarters have 91 days (i.e., 13 weeks). Only the first three quarters can start on the same day of the week. In the common years, only the second quarter has 91 days. The second and third quarters can start on the same day of the week. While the first three quarters have 273 day