count no. of month

[NongWa]

Hi

I have many sell records which start from 1 feb 2009, until now I want to count no. of month(it should be 15 months) in the calc. field but I don't know what function should be used. By using month(date), I face the problem of different year and can't count month.

I need your help.

Thanks.

[comment]

Try =

12 * ( Year ( Get(CurrentDate) ) - Year ( StartDate ) ) + Month ( Get(CurrentDate) ) - Month ( StartDate ) - ( Day ( Get(CurrentDate) ) < Day ( StartDate ) )