Unit 'DateUtils'	Package
[Overview][Constants][Classes][Procedures and functions][Index]	[#rtl]

StartOfADay

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

Declaration

Source position: dateutil.inc line 189

function StartOfADay(

const AYear: Word;

const AMonth: Word;

const ADay: Word

):TDateTime; overload; function StartOfADay(

const AYear: Word;

const ADayOfYear: Word

):TDateTime; overload;

Arguments

`AYear`		Year.
`AMonth`		Month in the year.
`ADay`		Day in the month.

Function result

Start of the given day as TDateTime.

Arguments

`AYear`		Year.
`ADayOfYear`		Day in the year.

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.

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

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.

StartOfADay

Declaration

Arguments

Function result

Arguments

Description

See also

Example