MonthsBetween¶

Calculate the number of whole months between two TDateTime values.

Declaration¶

Source position: dateutil.inc line 280

function MonthsBetween(const ANow: TDateTime; const AThen: TDateTime; 
                      AExact: Boolean=False) : Integer;

Arguments¶

Name	Description
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.

See also¶

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