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Mandatory update occurs only if information has changed such that the current reporting is no longer accurate.
There is no precise date of mandatory update.
In my experience, Experian lists the first of each month as the update for all my open accounts. On TU & EQ though, each account has a "last reported" date that is usually around a week after my payment due date - sometimes longer. Look on a TU or EQ report and you will be able to see when the creditor usually reports. Mine all typically report within a 3 day period each month - such as 13th-15th for one card, 10-13th on a different card, etc
You can also always contact your creditors to verify report dates. Keep in mind though that it can take a CRA several days to update after the data is reported.