Mega Code Archive
Dayoftheweek - gives day of week index for a tdatetime value [iso 8601] dateutils unit
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function DayOfTheWeek ( const Date : TDateTime ) : Integer;
Description
The DayOfTheWeek function returns an index number for the day of the week : 1 = Monday
2 = Tuesday
3 = Wednesday
4 = Thursday
5 = Friday
6 = Saturday
7 = Sunday
Notes
DayOfTheWeek is ISO 8601 compliant, since it uses Monday as the start of the week.
DayOfWeek is not compliant - it treats Sunday as the starting day.
Related commands
DayOfTheMonth Gives day of month index for a TDateTime value (ISO 8601)
DayOfTheYear Gives the day of the year for a TDateTime value (ISO 8601)
DayOfWeek Gives day of week index for a TDateTime value
MonthOfTheYear Gives the month of the year for a TDateTime value
Example code : Show the day of the week for Christmas 2002
var
myDate : TDateTime;
day : array[1..7] of string;
begin
// We cannot use LongDayNames - they start on Sunday
day[1] := 'Monday';
day[2] := 'Tuesday';
day[3] := 'Wednesday';
day[4] := 'Thursday';
day[5] := 'Friday';
day[6] := 'Saturday';
day[7] := 'Sunday';
myDate := EncodeDate(2002, 12, 25);
ShowMessage('Christmas day 2002 is on a '+day[DayOfTheWeek(myDate)]);
end;
Show full unit code
Christmas day 2002 is on a Wednesday
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