ObjectPascal
DayOfTheMonth
Function
Gives day of month index for a TDateTime value (ISO 8601) DateUtils unit
 function DayOfTheMonth ( const Date : TDateTime ) : Word;
Description
The DayOfTheMonth function returns an index number for the day of the month.
 
Depending on the year and month, the value is in the range 1..31
Related commands
DayOfTheWeek Gives day of week index for a TDateTime value (ISO 8601)
DayOfTheYear Gives the day of the year for a TDateTime value (ISO 8601)
DayOfWeek Gives day of week index for a TDateTime value
MonthOfTheYear Gives the month of the year for a TDateTime value
 
Example code : Show the day of the month for a TDateTime variable
var
  myDate : TDateTime;

begin
  myDate := EncodeDate(2002, 12, 31);
  WriteLn('The day of the month = '+IntToStr(DayOfTheMonth(myDate)));
end;
Show full unit code
   The day of the month = 31