[Overview][Constants][Procedures and functions][Index] Reference for unit 'DateUtils' (#rtl)

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

## Declaration

Source position: dateutil.inc line 180

## 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);