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Calculate the start of the day as a TDateTime value, given a moment in the day.
Source position: dateutil.inc line 178
function StartOfTheDay( 
const AValue: TDateTime 
):TDateTime; 
AValue 

TDateTime from which to calculate start of the day. 
Start of the day (00:00) as TDateTime value
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.

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


Return the first day of the week, given a date. 


Return a day of the week, given a year, week and day in the week. 


Return first date of month, given a year/month pair. 


Calculate the first day of the month, given a date in that month. 


Calculate a TDateTime value which represents the end of a week, given a date in that week. 


Return the last moment of day of the week, given a year and a week in the year. 


Calculate a TDateTime value representing the last day of a year, given a date in that year. 


Calculate a TDateTime value representing the last day of a year 


Calculate a TDateTime value representing the last day of the month, given a day in that month. 


Calculate a TDateTime value representing the last day of the indicated month 


Calculate a TDateTime value that represents the end of a given day. 


Calculates a TDateTime value representing the end of a specified day 
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.