How to find the difference between two dates and return the corresponding number of months in Dynamics NAV

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You could use a variable Calendar > Record > Date
IF (FromDate <> 0D) and (ToDate > FromDate) THEN BEGIN
    Calendar.RESET; 
    Calendar.SETRANGE("Period Type",Calendar."Period Type"::Month);
    Calendar.SETRANGE("Period Start",FromDate,ToDate);
    Months := Calendar.COUNT;
END ELSE
     Months := 0;

The problem with this type of code is 01 Jan 07 to 01 Feb 07 will return 2 Months.

When it is only 1 month 1 day!

31/01/06 and 01/02/06 will be 1 month
between 01/01/06 and 28/02/06 will be 2 Months

Date Difference in months.

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