MonthsBetween

Calculate the number of whole months between two DateTime values

Declaration

Source position: dateutil.inc line 256

function MonthsBetween(

const ANow: TDateTime;

const AThen: TDateTime

):Integer;

Arguments

`ANow`		First moment in time
`AThen`		Second moment in time

Function result

Number of whole months between ANow and AThen.

Description

MonthsBetween returns the number of whole months between ANow and AThen. This number is an approximation, based on an average number of days of 30.4375 per month (average over 4 years). This means the fractional part of a month is dropped.

YearsBetween		Calculate the number of whole years between two DateTime values
WeeksBetween		Calculate the number of whole weeks between two DateTime values
DaysBetween		Number of whole days between two DateTime values.
HoursBetween		Calculate the number of whole hours between two DateTime values.
MinutesBetween		Calculate the number of whole minutes between two DateTime values.
SecondsBetween		Calculate the number of whole seconds between two DateTime values.
MilliSecondsBetween		Calculate the number of whole milliseconds between two DateTime values.

Example

Program Example56;

{ This program demonstrates the MonthsBetween function }

Uses SysUtils,DateUtils;

Procedure Test(ANow,AThen : TDateTime);

begin
 Write('Number of months between ');
 Write(DateToStr(AThen),' and ',DateToStr(ANow));
 Writeln(' : ',MonthsBetween(ANow,AThen));
end;

Var
  D1,D2 : TDateTime;

Begin
  D1:=Today;
  D2:=Today-364;
  Test(D1,D2);
  D2:=Today-365;
  Test(D1,D2);
  D2:=Today-366;
  Test(D1,D2);
  D2:=Today-390;
  Test(D1,D2);
  D2:=Today-368;
  Test(D1,D2);
  D2:=Today-1000;
  Test(D1,D2);
End.