Subversion Repositories wimsdev

!! input is two word : first is type and second is date format YYYYMMDD

!! type are :

!! - whatday : calculate num of day in the week

!! - nextday : calculate date for next day

!! - prevday : calculate date for previous day

:: - endmonth : calculate number of day to the end of the month

!distribute word $wims_read_parm into type_,val_

j_=!char 7 to 8 of $val_

m_=!char 5 to 6 of $val_

a_=!char 1 to 4 of $val_

l_=31,28,31,30,31,30,31,31,30,31,30,31

!reset output

!if $type_ notitemof whatday,nextday,endmonth,prevday

  !exit

!else

  !goto $type_

!endif

:whatday

!! use Mike Keith algorythm (year must be between 1583 and 9999) 

!! 1=Monday etc...

!ifval $m_=1 or $m_=2 

  c_=1

!else

  c_=0

!endif

A_ = $[$a_ - $c_]

M_ = $[$m_ + 12*$c_ - 2]

output = $[( $j_ + $A_ + floor($A_/4) - floor($A_/100) + floor($A_/400) + floor((31*$M_)/12) )%7]

!if $output=0

  output=7

!endif

!exit

:nextday

!ifval $m_=2 and $j_=28

  !ifval $a_%4=0 and ($a_%400=0 or $a_%100!=0)

    output=$(a_)0229

  !else

    output=$(a_)0301

  !endif

!else

  !ifval $j_<$(l_[$m_])

    j_=!char 2 to 3 of $[101+$j_]

    output=$a_$m_$j_

  !else

    !ifval $m_=12

      a_=!char 2 to 3 of $[101+$a_]

      output=$(a_)0101

    !else

      m_=!char 2 to 3 of $[101+$m_]

      output=$a_$(m_)01

    !endif

  !endif

!endif

!exit

:prevday

!ifval $j_>1

  j_=!char 2 to 3 of $[99+$j_]

  output=$a_$m_$j_

!else

  !ifval $m_>1

    !ifval $m_=3 and $a_%4=0 and ($a_%400=0 or $a_%100!=0)

      output=$(a_)0229

    !else

      m_=!char 2 to 3 of $[99+$m_]

      output=$a_$m_$(l_[$[$m_]])

    !endif

  !else

    a_=$[$a_-1]

    output=$(a_)1231

  !endif

!endif

!exit

:endmonth

l_=!item $m_ of $l_

!ifval $m_=2 and $a_%4=0 and ($a_%400=0 or $a_%100!=0)

    l_=29

!endif

output=$[$l_-$j_+1]

!exit