This is the calendar for any common year starting on Saturday, January 1 (dominical letter B). Examples: Gregorian years 1994, 2005, 2011 and 2022 or Julian years 1905 and 1911 (see bottom tables). The question mark for the ISO week before week 1 is due to ambiguity based on whether or not the previous year was a leap year. If it was, then that week is week 53, if it was a common year then it is week 52. A common year is a year with 365 days, i.e., not a leap year. Previous year (common) Next year (Common) Previous year (leap) Next year (leap)