Does NYSE opening mean COMEX opening?

No. They are different markets with separate schedules.

Can I use one Thai-time offset all year?

No. Convert the named local time for the actual date because London and New York observe DST.

Dated source reference; not a live quote.

LSE core stocks

08:00–16:30 London local time.Source: London Stock Exchange personal-investing FAQ · Checked: 2026-10-25

NYSE core equities

09:30–16:00 ET.Source: NYSE Holidays & Trading Hours · Checked: 2026-10-25

Does NYSE opening mean COMEX opening?: No. They are different markets with separate schedules.
Can I use one Thai-time offset all year?: No. Convert the named local time for the actual date because London and New York observe DST.