Stored procedures sp_iqbackupsummary and sp_iqrestoreaction may give incorrect output if:
Backup action was performed within 1 hour of DST end activity, or
System time is changed (for example, set back in the past).
Stored procedures serve informational purposes. Sybase recommends that the DBA compare the output of the sp_iqbackupsummary and sp_iqrestoreaction procedures against the output of views SYSIQBACKUPHISTORY and SYSIQBACKUPHISTORYDETAIL to decide the restore sequence.