Daylight saving mismatch weeks catch time-based strategies every year

[Shadow Trader]

The US and Europe don't change their clocks on the same dates. For a couple of weeks in spring and again in autumn, the gap between New York and London is an hour different from normal.

That shifts everything tied to local times. The London open lands an hour earlier or later relative to the New York open. Economic releases fixed to New York time arrive at a different hour in London. Overlap windows shrink or stretch.

Strategies built around the London and New York crossover can behave differently without a single change in code. A filter that says "trade only between 13:00 and 16:00 server time" quietly stops matching the real overlap.

The stretch is short, but it keeps catching people because it only happens twice a year and nobody remembers it in between.

A simple habit is checking the clock-change dates for both regions each year and marking those weeks on the calendar. Rules written against GMT or UTC, not server time, avoid most of the confusion.

Does anyone adjust the schedule during those weeks, or does it just get absorbed as noise?