I have set up my remindsystem to give some yearly triggers looking something like this: FSET yearsince(x) year(trigdate())-x REM 15 OCT Someone will be [yearsince(1973)] years old And now I want to do the same for some entries but count months instead: REM 15 OCT Something happend [monthsince(200403)] months ago Any idea howto create such a function?