The impact of changing SAP system time zone.

Hello gurus,
We are in the company located in UTC+8 Time Zone. but during the system installation, the setting in SAP (tcode:STZAC) of the system time zone is CET, which is, not correct, and cause some issues: such as, when we try to send mail via SAP smtp, the sent time in the mail is always wrong.
We tried to modify it to UTC+8, but since we already go live for several months, there're lots of application data in the system. Before that we need to make sure that this change will not affect the current implementation.
Do you experts know the impact or risk of changing the system time zone after going live?
Regards,
Charlie

Lets look at this from a logic perspective,  if your system is CET and you are moving to UTC+8 you are going a few hours ahead... so basically you'll find a gap in time in between the documents but you wont find any time conflict. So based on that it should be safe. You certainly need to check your jobs and make sure all necesary jobs will run so you can reschedule them if skipped by the time change (I guess).
Regards
Juan

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