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

MonthSpan

Calculate the approximate number of months between two TDateTime values.

Declaration

Source position: dateutil.inc line 285

function MonthSpan(

  const ANow: TDateTime;

  const AThen: TDateTime

):Double;

Arguments

ANow

  

First moment in time

AThen

  

Second moment in time

Function result

Number (fractions included) of months between ANow and AThen

Description

MonthSpan returns the number of month between ANow and AThen, including any fractional parts of a month. This number is an approximation, based on an average number of days of 30.4375 per month (average over 4 years).

See also

YearSpan

  

Calculate the approximate number of years between two TDateTime values.

WeekSpan

  

Calculate the approximate number of weeks between two TDateTime values.

DaySpan

  

Calculate the approximate number of days between two TDateTime values.

HourSpan

  

Calculate the approximate number of hours between two TDateTime values.

MinuteSpan

  

Calculate the approximate number of minutes between two TDateTime values.

SecondSpan

  

Calculate the approximate number of seconds between two TDateTime values.

MilliSecondSpan

  

Calculate the approximate number of milliseconds between two TDateTime values.

MonthsBetween

  

Calculate the number of whole months between two TDateTime values

Example

Program Example64;

{ This program demonstrates the MonthSpan function }

Uses SysUtils,DateUtils;

Procedure Test(ANow,AThen : TDateTime);

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

Documentation generated on: May 14 2021