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type TDateTime = type Double;
function DayOfWeek(Date: TDateTime): integer;
Returns the day of the week for a given date.
DayOfWeek returns an integer between 1 and 7, where Sunday is the first day of the week and Saturday is the seventh.
DayOfTheWeek is not compliant with the ISO 8601 standard.
const Days: array[1..7] of string =
('Sunday', 'Monday', 'Tuesday',
ShowMessage('Today is ' + Days[DayOfWeek(Date)]);
//Today is Monday
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