Reference for package '#rtl'

StartOfADay

Return the start of a day as a TDateTime value, given a day indication

Declaration

Source position: dateutil.inc line 167

  function StartOfADay(const AYear: Word; const AMonth: Word; 
                      const ADay: Word) : TDateTime;  Overload;
  function StartOfADay(const AYear: Word; const ADayOfYear: Word)
                       : TDateTime;  Overload;

Description

StartOfADay returns a TDateTime value with the date/time indication of the start (0:0:0.000) of the day given by AYear, AMonth, ADay.

The day may also be indicated with a AYear, ADayOfYear pair.

See also

Name Description
EndOfADay Calculates a TDateTime value representing the end of a specified day
EndOfAMonth Calculate a TDateTime value representing the last day of the indicated month
EndOfAWeek Return the last moment of day of the week, given a year and a week in the year.
EndOfAYear Calculate a TDateTime value representing the last day of a year
EndOfTheDay Calculate a TDateTime value that represents the end of a given day.
EndOfTheMonth Calculate a TDateTime value representing the last day of the month, given a day in that month.
EndOfTheWeek Calculate a TDateTime value which represents the end of a week, given a date in that week.
EndOfTheYear Calculate a TDateTime value representing the last day of a year, given a date in that year.
StartOfAMonth Return first date of month, given a year/month pair.
StartOfAWeek Return a day of the week, given a year, week and day in the week.
StartOfTheDay Calculate the start of the day as a TDateTime value, given a moment in the day.
StartOfTheMonth Calculate the first day of the month, given a date in that month.
StartOfTheWeek Return the first day of the week, given a date.

Example

Program Example38;
{ This program demonstrates the StartOfADay function }
Uses SysUtils,DateUtils;
Const
  Fmt = '"Start of the day : "dd mmmm yyyy hh:nn:ss';
Var
  Y,M,D : Word;
Begin
  Y:=YearOf(Today);
  M:=MonthOf(Today);
  D:=DayOf(Today);
  Writeln(FormatDateTime(Fmt,StartOfADay(Y,M,D)));
  DecodeDateDay(Today,Y,D);
  Writeln(FormatDateTime(Fmt,StartOfADay(Y,D)));
End.