The 'Last_Updated_Date' in the Project Team (PRTEAM) record is updated by the Time Slicing job when it completes the processing of the record.
The completion date and time of the Time Slicing job replaces the prior Last Updated Date of the time the actual user that made the change.
1. user(aaaa) updates the Team tab for user(bbb), and Last_Updated_Date = 8/1/2018
Last_Updated_by still reflects user(aaa)
2. On 8/2/2018,
user(aaa) is no longer active but then user(ccc) makes a change to the calendar for user(bbb).
The next instance of the Time Slicing job willl update the PRTEAM record with Last_Updated_Date = 8/2/2018