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A surprising number of "the setup stopped working" complaints turn out to be a time offset problem. Broker servers usually run on GMT+2 or GMT+3 with a daylight saving shift that follows New York rather than London. That detail matters twice a year, because the US and Europe change clocks on different weekends.

For about two or three weeks in March and again in late October or early November, the gap between server time and local time is different from what it normally is. Anyone who built rules around "the 10:00 bar" or "the first five minutes after the London open" can find that the bar has quietly slid an hour relative to the real market event.

The same applies to indicators that mark session boxes or Asian range highs. If the script assumes a fixed offset, the box is drawn at the wrong hours during those weeks, and the range it reports contains the wrong data.

Even a lot of experienced scalpers treat the time axis as fixed. It isn't. Time zones, brokers' own conventions, and platform settings all move independently.

A quick sanity check works well: open the chart on the day of the data release, look at where the spike actually printed, and compare it to the published release time. If they line up, the offset is right. If they don't, everything built on session timing is off.

There's a quick way to catch this in the act. On a day when the clock changes in one region but not the other, open a chart with session boxes drawn and compare the box edges with the actual first spike of the London open. If the spike lands a full hour before or after the box, the script is still on the old offset.

Scripts that hard-code hours are the usual culprits, while ones that read the broker's GMT offset from the platform adapt on their own.

Has a clock change ever shifted a setup on you without you noticing straight away?

It happened to me this very week, as it happens. My broker's server moved its clock on the US schedule, my laptop moved on the European one, and for a few days I had a gap I wasn't expecting. I only noticed because my London open breakout on GBPUSD kept triggering on what looked like a dead candle, and the real push came an hour after my box had already closed.

What gave it away in the end was exactly the check you mention. I pulled up the German manufacturing release on the one minute chart and the spike sat a full bar row away from where my notes said it should be. Once I saw that, everything else made sense.

The fix I settled on was swapping my session indicator for one that reads the offset from the terminal instead of having hours typed into the inputs. I also keep a sticky note on the monitor for the two odd weeks each spring and autumn, reminding me to check one release before trusting any session box.