Start dates are not part of the Google Apps Directory. There are two places TeamTools looks for start dates. First, TeamTools looks to see if your Google Apps administrator has introduced a Custom User Field called “startDate”. This might have been done using the Directory API or using Google Apps Directory Sync to synchronize to a LDAP directory server.
If no such Custom User Field exists, then TeamTools gets user start dates from the creation date of that user’s record in Google Apps Directory. To see your Directory, go to Contacts and click on the Directory link in the left column.