- julianDay
- The julian day to calculate the week number for
- firstDayOfWeek
- Which week day is the first day of the week, see Time.SUNDAY
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Returns the week since Time.EpochJulianDay (Jan 1, 1970) adjusted for first day of week. This takes a julian day and the week start day and calculates which week since Time.EpochJulianDay that day occurs in, starting at 0. *Do not* use this to compute the ISO week number for the year.