In Customizing, choose General SettingsTime ZonesMaintain Time Zones.
Since the parts of a time zone's structure build on each other, define time zones by completing the table as follows:
First define the variable daylight saving time rules or fixed daylight saving time dates (choose Variable summer time rules or Fixed summer time rules).
Then define the daylight saving time offsets (choose Summer Time Rules).
Next define the time zone offsets (choose Time Zone Rules).
Next define the time zone indicators (choose Time Zones).
If you have filled the individual tables, save your data.