Session DST Audit: Does a Fixed-Offset Session Drift?WHAT IT DOES
Session DST Audit takes one session string, such as 0930-1600, and checks it twice on every bar of an intraday chart: once in a DST-aware reference zone, for example America/New_York, and once in the zone under test, for example the fixed offset UTC-5. A session string is a local wall-clock window, so the two readings agree only while the two zones share the same UTC offset. When daylight saving time moves the reference clock and the fixed offset stays put, the tested window drifts:
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