The server time confusion that ruins session stats

[Amanhasnoname]

Most retail brokers run server time on something like GMT+2 or GMT+3, shifting with daylight saving in New York terms. That sounds harmless until a trader tags trades by session and finds out half the data is filed in the wrong bucket.

A 'London open' trade at 08:00 London time might show up as 10:00 or 11:00 on the platform, depending on the season. When both the US and the UK change clocks on different weekends, there are a few weeks each year when the gap between server time and local sessions is off by an extra hour.

That can create phantom findings, like a profitable window at 15:00 that is really just the NY open mixed with the end of London.

The cure is boring. Convert everything to UTC before analysis, and record the offset in use whenever a journal entry is made. Do not trust the platform clock for anything except trade order.

A single wrong offset can make a good session look bad, or hide a leak.

Has a time zone mistake ever distorted a conclusion from your journal or backtests?