System Timezone problem

Hi,

I got problem with Timezone.

Unfortunately, I cannot change the time zone right now because Set wrongly when installing erpnext.
Even tried change at Database. But same problem still goes on.

Any suggestion.

Hi @kamransuleymanli:

Tried using User Timezone? Actually, timezone will be provided by user configuration …

Thanks for respond,
Yes, changed all users timezone,

But problem is when I created Report at datetime columns all datetimes show with America/Los_angeles timezone
I belive main problem is with Notification.
One of that datetime column work like this: when the deadline approaches system send a notification mail. And when that happen that field datetime change to system timezone.