mondayStartWeek

mondayStartWeek :: Day -> (Int, Int)
time Data.Time.Calendar.OrdinalDate
Get the number of the Monday-starting week in the year and the day of the week. The first Monday is the first day of week 1, any earlier days in the year are week 0 (as "%W" in formatTime). Monday is 1, Sunday is 7 (as "%u" in formatTime).
fromMondayStartWeek :: Integer -> Int -> Int -> Day
time Data.Time.Calendar.OrdinalDate
The inverse of mondayStartWeek. Get a Day given the year, the number of the Monday-starting week, and the day of the week. The first Monday is the first day of week 1, any earlier days in the year are week 0 (as "%W" in formatTime).
fromMondayStartWeekValid :: Integer -> Int -> Int -> Maybe Day
time Data.Time.Calendar.OrdinalDate