Hi @bbsin ,
One of the brackets for both buttons has been misplace causing an error when running the formula and hence the dates are not showing.
Please try the below for the Previous Month button:
Set(varCalMonth, DateAdd(varCalMonth, -1,TimeUnit.Months));
Set(varCalMonthFirstDayView, DateAdd(varCalMonth, - Weekday(varCalMonth),TimeUnit.Days));
and this for the Next Month button:
Set(varCalMonth, DateAdd(varCalMonth, 1,TimeUnit.Months));
Set(varCalMonthFirstDayView, DateAdd(varCalMonth, - Weekday(varCalMonth),TimeUnit.Days));