This may be by design; IDK.

Deploy->Jobs->Add new->Filter tab. Add column for "timestamp". By default sorting is ascending and the criteria for begin/end is shown. If however you click to sort descending the criteria disappears. See attached screenshots. The same issue is present for Process Management->Process Instances->Add new->Filter tab; columns "start_date", "end_date", "lastModificationDate" i.e. all Date fields. It is also present for Tasks and Date fields.