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get day-of-week corresponding to month, day, year

integer function wkday (month, day, year)
integer month, day, year

'Wkday' is used to return the day-of-the-week corresponding to a
given date.
The three arguments completely specify the date:
the month (1-12), day (1-28, 29, 30, or 31), and year (e.g. 1980).
The function return is the ordinal number of the day-of-the-week
(1 == Sunday, 7 == Saturday).

Zeller's Congruence.

getnow (2), fmtdat (2), date (1)