Time Tag Errors

interval             stn  error
Apr.29-May 22, 1998  WEP  Time tag data are 12 hours ahead the correct time.
Apr.24-May 22, 1998  DAL  Time tag data are 1 hour behind the correct time.
Aug.29-Sep.17, 1998  DAL  Time tag data are 1.5 hour behind the correct time.
Sep.24-Oct.22, 1998  DAL  Time tag data are 1.5 hour ahead the correct time.
Nov.16, 1998 -       DAL  Time tag data are 1.5 hour ahead the correct time.
Apr.14-May 7, 1999   KAT  Time tag data are 9 hours ahead the correct time.

Geomagnetic Observation by Magnetometer Network.