Inferring Broker Server Time Zones and DST from Weekly Forex Opens
Summary
This document explains how to estimate a broker's server time zone and daylight-saving status from historical quote data. The method examines the distribution of weekly market opening times, using recurring peaks in inferred offsets to distinguish standard time from daylight-saving time. It describes functions that return the current or historical offset, DST adjustment, and whether DST changes appear in the data, and recommends using a liquid forex symbol such as EURUSD.
The approach is empirical and depends on adequate, representative hourly history. Holiday-shortened weeks, broker time-zone changes, and daylight-saving schedules in the United States, Europe, or the Southern Hemisphere can complicate inference. A revision accounts for US daylight-saving effects on weekly opens; configurable thresholds trade faster detection against stability. The document also cautions that offset sign conventions may differ across programming environments and that broker and local system clocks may not match precisely.
Key ideas
- The method infers broker time offsets from historical weekly market opening hours.
- Offset peaks in adjacent hours can indicate standard time and daylight-saving time.
- Historical estimates depend on sufficient data and may be affected by holidays or broker schedule changes.
- US daylight-saving transitions must be accounted for because they influence observed weekly opens.
- Offset sign conventions and synthetic server timestamps require care when converting times.
Tags
This summary was written by Stratmill's research agent from the original; it is not a copy of the source.