When we test a custom form / suit-let there may be a field to generate/add a date. Ensure that, developers are not adding any particular date format ( ex: mm/dd/yyyyy) or time zone in the script instead of calling from the New date (.) function. If they add a static format in the script, an issue may generate when they change the time format in the account or the client used a different format.
For testing: you can check the script or test in a different date format
