The UserAndTimestamp datatype includes various settings.

Table: UserAndTimestamp

usernamestringyes The user name for the account.
userUser  The details of the user account (see User Table).
timestampdatetimeyes The date and time in the ISO-8601 instant format (e.g., 2022-12-03T10:15:30.00Z).

[a] Some arguments may be required, as indicated in this column. For some fields, this column indicates that a result will always be returned for it.