Skip to content

    StartOfTheMonth

    Calculate the first day of the month, given a date in that month.

    Declaration

    Source position: dateutil.inc line 166

    function StartOfTheMonth(const AValue: TDateTime) : TDateTime;

    Arguments

    Name Description
    AValue Date to return first of month from.

    Function result

    First day of month as a TDateTime value.

    Description

    StartOfTheMonth extracts the year and month parts of AValue and returns a TDateTime value with the date of the first day of that year and month as the StartOfAMonth function.

    See also

    Name Description
    StartOfAMonth Return first date of month, given a year/month pair.
    EndOfTheYear Calculate a TDateTime value representing the last day of a year, given a date in that year.
    EndOfAYear Calculate a TDateTime value representing the last day of a year.
    EndOfTheMonth Calculate a TDateTime value representing the last day of the month, given a day in that month.
    EndOfAMonth Calculate a TDateTime value representing the last day of the indicated month.
    StartOfAWeek Return a day of the week, given a year, week and day in the week.
    StartOfTheWeek Return the first day of the week, given a date.

    Example

    Program Example28;

{ This program demonstrates the StartOfTheMonth function }

Uses SysUtils,DateUtils;

Const
  Fmt = '"First day of this month : "dd mmmm yyyy';

Begin
  Writeln(FormatDateTime(Fmt,StartOfTheMonth(Today)));
End.