data syThe following table shows the system fields that contain information about date and time. Flag for summer time in the system time zone. During summer time, X, otherwise . FactorySY-DATUM and the system fields for the local time zone, that is SY-TIMLO, SY-DATLO, and SY-ZONLO are also reset. SY-DATLO Local date of user, for example 19981129, 19990628.