Say you have a date entered into a field named DateField
Date ( Month ( DateField ) + 1 ; Day ( DateField ) ; Year ( DateField ) )
will compute a date 1 month later than the date in DateFIeld
Date ( Month ( DateField ) ; Day ( DateField ) ; Year ( DateField ) + 1 )
will compute a date 1 year later.
But you'll have to watch out for dates with day values from 29 - 31. The calculation will return a valid date, but it will adjust to return a value near the start of the following month when the resulting month, day, year values would otherwise produce a date with a day not possible for the specified month.
Thanks yet again misterPhilModJunk!!