1. Click Config > Business Rules
2. Select Alumni options
3. Select YYYY for a four-digit year format or 'YY for a two-digit year format

Note: If two-digit format is selected, some years may appear in four-digit format to distinguish class years beginning with 19 rather than 20.  For example, Class of 2015 will display as '15 while Class of 1915 will display as 1915.