Question

Is it a bad thing for your bill to be put on the calendar?

Answer 1

Mostly likely, yes. 
Losing track of the calendar or someone else getting ahold of it can cause serious problems with personal information. 

Answer 2

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NOT  EXACTLY IF YOUR BILL HAS A DUE DATE THEN IT CAN POSSIBLY BE BAD DUE TO THE DATE ON WHEN IT WAS LATE HOPE THIS HELPED!∡