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Get the weekday on any given date

e.g. 01.01.1990 ==> Monday

Func GetWeekday($M, $D, $Y)
    Static $WeekDay[7] = ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"]
    If ($M < 3) Then
        $M += 12
        $Y -= 1
    $wd = Mod($D + (2 * $M) + Floor(6 * ($M + 1) / 10) + $Y + Floor($Y / 4) - Floor($Y / 100) + Floor($Y / 400) + 1, 7)
    Return $WeekDay[$wd]
EndFunc    ;==> GetWeekday() AutoIt v3.3.12.0

; GetWeekday(Month, Day, Year)
MsgBox(0, "Get Weekday", GetWeekday(1, 1, 1990))     ; 1990-01-01 --> Monday
MsgBox(0, "Get Weekday", GetWeekday(4, 15, 2014))    ; 2014-04-15 --> Tuesday
MsgBox(0, "Get Weekday", GetWeekday(9, 9, 1999))     ; 1999-09-09 --> Thursday


#include <Date.au3>

MsgBox(0, "", _DateDayOfWeek(_DateToDayOfWeek(@YEAR, @MON, @MDAY)))
Edited by kaesereibe

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Great job! :)


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Your function is faster since

1.  it has no error checking.  try 1,0,1990

2.  it has no support for locale languages    German, French, ...

App: Au3toCmd              UDF: _SingleScript()                             

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