Vaibhav,
I think I got your problem,
Kindly create a Calculated column for longdate("LOGGEDON") as CC1
then you already has Calculated created column of yours with (adddays(now(),-30)) as CC2
then compare the Expression , you will not get the error.
Regards,
Chandan
Vaibhav,
try add_months(current_date, -1)
here is the official documentation for the add_months function
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