This is the time of year when many locations are changing the local time - either ahead for Daylight Saving or Summer Time, or back for Standard time.
As a reminder, we have written a couple Knowledge Base articles to help you in your planning.
KB000046307, titled "DST Time Change Instructions for CA Datacom/DB and CA Datacom/AD on z/OS"
KB000046173, titled "DST Time Change Instructions for CA Datacom/DB and CA Datacom/AD on z/VSE"
If you have further questions beyond these articles, please open a new support case for your CA Datacom product.