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

# DaysInMonth

Return the number of days in the month in which a date occurs.

## Declaration

Source position: dateutil.inc line 113

`function DaysInMonth(`
`const AValue: TDateTime`
`):Word;`

## Arguments

`AValue` |  | Date in month of which to calculate the number of days.

## Function result

Number of days in the month in which AValue occurs.

## Description

DaysInMonth returns the number of days in the month in which AValue falls. The return value takes leap years into account.

## See also

WeeksInAYear |  | Return the number of weeks in a given year
WeeksInYear |  | return the number of weeks in the year, given a date
DaysInYear |  | Return the number of days in the year in which a date occurs.
DaysInAYear |  | Number of days in a particular year.
DaysInAMonth |  | Number of days in a month of a certain year.

## Example

    Program Example16;

    { This program demonstrates the DaysInMonth function }

    Uses SysUtils,DateUtils;

    Var
      Y,M : Word;

    Begin
      For Y:=1992 to 2010 do
        For M:=1 to 12 do
          Writeln(LongMonthNames[m],' ',Y,' has ',DaysInMonth(EncodeDate(Y,M,1)),' days.');
    End.