You can change the SAP system Time zone by maintaining table TTZCU in SM30. But you should aware that changing the sytem time zone will affect all clients.

Here’s how you change the SAP system time zone.

1. Execute tcode SM30.

2. Type in the table name TTZCU and click the maintain button.

3. Next you will be prompted with a dialog box telling you that changing the time zone will affect all clients, if you’re sure then just click YES.

4. In the system time zone, click on F4 to select which time zone you want to change.

5. Save your changes, to see the changes you made, you need to restart the SAP.

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