hi, this is the simple problem but you need to change the code for a bit.
time zone is servers time zone has nothing to do with user TZ.
resolutions has two pats:
1: change jsp pages ( about 5-10 places)
code needed contains 10 characters example #{Bean.timezone}
2:remember time zone that you want for specific tenant
2.a for all users ( override bean for example UserPreferencesBean )
2.b for specific user
2.b.1 add aspect for time zone setting
2.b.2 add dialog for time zone set up
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maybe add index on aspects propertie timezone (fun thing). this should do it.
I have not seen any setting for this, if you find it please report to me.