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# dwy_to_mjd(++DWY, ++FirstWeekday, ?MJD)

Convert a DayOfWeek/WeekOfYear/Year representation to MJD

DWY
  Structure of the form Day/Week/Year
FirstWeekday
  Atom (monday,tuesday,etc)
MJD
  Variable or integer

## Description

as dwy_to_mjd/2, but allows to choose a different starting day for weeks, specified as atom monday, tuesday etc