Return the day of the week.
Source position: dos.pp line 68
function weekday(  | 
y: LongInt;  | 
m: LongInt;  | 
d: LongInt  | 
):LongInt;  | 
WeekDay returns the day of the week on which the day Y/M/D falls. Sunday is represented by 0, Saturday is 6.
On error, -1 is returned.
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Pack DateTime value to a packed-time format.  | 
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Unpack packed file time to a DateTime value.  | 
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Return the current time.  | 
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Set system time.  |