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Calculate the approximate number of months between two DateTime values.
Source position: dateutil.inc line 272
function MonthSpan( 
const ANow: TDateTime; 
const AThen: TDateTime 
):Double; 
ANow 

First moment in time 
AThen 

Second moment in time 
Number (fractions included) of months between ANow and AThen
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).

Calculate the approximate number of years between two DateTime values. 


Calculate the approximate number of weeks between two DateTime values. 


Calculate the approximate number of days between two DateTime values. 


Calculate the approximate number of hours between two DateTime values. 


Calculate the approximate number of minutes between two DateTime values. 


Calculate the approximate number of seconds between two DateTime values. 


Calculate the approximate number of milliseconds between two DateTime values. 


Calculate the number of whole months between two DateTime values 
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:=Today364; Test(D1,D2); D2:=Today365; Test(D1,D2); D2:=Today366; Test(D1,D2); D2:=Today390; Test(D1,D2); D2:=Today368; Test(D1,D2); D2:=Today1000; Test(D1,D2); End.