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Convert an MJD to ISO8601 Year-Week-Day representation
- Integer or float
- Variable or structure of the form Year-Week-Day
Convert MJDs to a Year-WeekOfYear-DayOfWeek representation
according to ISO 8601, where DayOfWeek is the day number within the
week (1 for monday up to 7 for sunday), and WeekOfYear is the ISO8601
week number (where week 1 is the week containing January 4th).
Note that January 1 to 3 may belong to the previous year.