TradeLocker uses a fixed system timezone (EET / UTC+3) across the application for core account data. This means key timestamps and calculations such as trading hours, order and position timestamps, and P&L are handled consistently in that timezone and cannot be changed from the user side.
You can, however, change the timezone shown on the chart. That setting only affects how candle timestamps are displayed on the chart axis. It does not change account-level timestamps, execution times, or any other time-based data elsewhere in the platform.