Definition
Is a monthly period
A relative reference in @if statements.
Time period detail is set in Defining, Deleting, and Displaying Time Periods.
Returns
True—if the period is in months
False—if not
Example
If 2006 is in years and 2007 is in months, this formula:
@if(@ismonth, 1, 2)
returns 2 for 2006, and 1 in monthly periods for 2007.