StartOfADay

Return the start of a day as a DateTime 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;

Arguments

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

Function result

Start of the given day as DateTime

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 DateTime 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 DateTime 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 DateTime value representing the last day of a year, given a date in that year.
EndOfAYear		Calculate a DateTime value representing the last day of a year
EndOfTheMonth		Calculate a DateTime value representing the last day of the month, given a day in that month.
EndOfAMonth		Calculate a datetime value representing the last day of the indicated month
EndOfTheDay		Calculate a datetime value that represents the end of a given day.
EndOfADay		Calculates a DateTime 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