Gregorian Calendar to Solar Calendar Converter

[amin84]

I needed to convert Gregorian calendar to Solar calendar and I didn't find anything in AutoIt so I wrote my own. I'm pretty sure there are lots of better and more optimized formulas compared to mine. I still don't know how to calculate the name of the day (sat,sun,...).

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_miladi2shamsi(@MDAY, @MON, @YEAR)

Func _miladi2shamsi($Dm, $Mm, $Ym)
    Dim $d, $p, $w, $mon, $u, $v, $rp, $x, $i, $Ys, $Ms, $P1, $D1, $Ds, $DateShamsi
    Local $d[12] = [20, 19, 20, 20, 21, 21, 22, 22, 22, 22, 21, 21]
    Local $p[12] = [11, 12, 10, 12, 11, 11, 10, 10, 10, 9, 10, 10]
    $u = 0
    $rp = 0
    If Mod($Ym, 4) = 0 Then $u = 1
    If Mod($Ym, 100) = 0 And Mod($Ym, 400) <> 0 Then $u = 0
    $Ys = $Ym - 622
    $x = $Ys - 22
    $x = Mod($x, 33)
    If Mod($x, 4) = 0 And $x <> 32 Then $rp = 1
    $i = Not ($rp - 2) + Not ($u - 2) * 2
    $x = 0
    If $i = 0 And $Mm = 3 Then $x = 1
    If $i = 0 Then $i = 3
    $Ms = Mod((9 + $Mm), 13)
    If $Ms < 10 Then $Ms = $Ms + 1
    $D1 = $d[$Mm - 1]
    If $i = 1 And $Mm > 2 Then $D1 = $D1 - 1
    If $i = 2 And $Mm < 3 Then $D1 = $D1 - 1
    $P1 = $p[$Mm - 1]
    If $i = 1 And $Mm > 2 Then $P1 = $P1 + 1
    If $i = 1 And $Mm < 4 Then $P1 = $P1 + 1
    If $Dm > 0 And $Dm <= $D1 Then
        $Ds = $P1 + $Dm + $x - 1
        $x = 1
    Else
        $Ds = $Dm - $D1
        $Ms = $Ms + 1
        If $Ms = 13 Then $Ms = 1
        $x = 2
    EndIf
    If (($Mm = 3 And $x = 2) Or $Mm > 3) Then $Ys = $Ys + 1
    MsgBox(0,'',$Ys&'/'&$Ms&'/'&$Ds)
EndFunc

[JScript]

I did not understand very well... but show!