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

# StartOfTheDay

Calculate the start of the day as a TDateTime value, given a moment in the day.

## Declaration

Source position: dateutil.inc line 178

`function StartOfTheDay(`
`const AValue: TDateTime`
`):TDateTime;`

## Arguments

`AValue` |  | TDateTime from which to calculate start of the day.

## Function result

Start of the day (00:00) as TDateTime value

## Description

StartOfTheDay extracts the date part of AValue and returns a TDateTime value with the date/time indication of the start (0:0:0.000) of this day.

## See also

StartOfADay |  | Return the start of a day as a TDateTime value, given a day indication
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 Example36;

    { This program demonstrates the StartOfTheDay function }

    Uses SysUtils,DateUtils;

    Const
      Fmt = '"Start of the day : "dd mmmm yyyy hh:nn:ss';

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