Key takeaways
- The US and Europe change clocks on different dates, creating transition weeks.
- Plan server time and session adjustments in advance.
- Tell clients about changed trading hours.
Why DST matters
Many brokers set server time so that daily candles align with the New York close. When clocks change, trading sessions for indices, commodities and stocks shift relative to server time, and candles and swaps can be affected if nothing is adjusted.
Plan the change
- List the change dates for each relevant market (US, EU, UK, others).
- Decide how your server time policy handles the transition weeks.
- Identify symbols whose sessions must be adjusted.
Execute and verify
- Update sessions in a maintenance window.
- Publish a client notice with new trading hours.
- After the change, verify that quotes and trading start and stop at the right times.
- Check that daily candles close as expected.
See the DST checklist.