The charter date field for organizational accounts (used for birth date on individual memberships) does not support a century other than 19xx or 20xx.  We suggest for any charter dates prior to 1900 that you enter 1900, using that as your visual clue to look at either a Tracker or Account Comments, or perhaps even create a custom field to store the actual charter date should you need it for any reason in the future.

As a rule charter dates are simply informational and are rarely used by any CU*BASE function.  Even age-related analyses on various dashboards generally lump all organizational memberships into a separate category since the charter date has nothing to do with a person's age.