Is DISK BACKUP and RESTORE affected by DAYLIGHT SAVINGS TIME (DST)?
z/os Disk Release 12.5 and 14.0
During Fall Daylight Savings time Disk would be affected if backup/archive is run in the hour after the fall back. Disk could create an entry for the new backup with an ‘older time”. As long as the database/data set is not reorganized, the versions will be okay. But it is recommended not to run backup/archive during that hour.
During Spring Daylight Savings time Disk is not affected because the time isn't replicated.