GMT to LHST Converter

Standard business hours (9 AM–5 PM, Mon–Fri) in Greenwich Mean Time and Lord Howe Time don't overlap on the same weekday. Lord Howe Time is 10 hours ahead of Greenwich Mean Time.

With some flexibility, there’s a workable window outside standard hours:

• 7 AM–11 AM in Greenwich Mean Time (4 PM–8 PM in Lord Howe Time) — suggest 9:00 AM Greenwich Mean Time (6:30 PM Lord Howe Time).

This means an early start or late finish for one side, but it’s a reasonable slot for a one-off meeting.

Greenwich Mean Time is also known as GMT, or BST. To call United Kingdom, dial +44.

Lord Howe Time is also known as LHST, or LHDT. To call Australia, dial +61.

Lord Howe Time is approximately 10,700 miles northeast of Greenwich Mean Time.

Both zones observe daylight saving time, but they transition on different dates.

Greenwich Mean Time: next transition on Sunday, October 25, 2026.

Lord Howe Time: next transition on Sunday, October 4, 2026.

Greenwich Mean Time and Lord Howe Time are in opposite hemispheres, so their clocks change in opposite directions about six months apart — one springs forward while the other falls back. The offset between them therefore shifts twice a year and can swing by up to two hours across the seasons, more than a typical same-hemisphere pair. Recurring meetings will need re-checking after each transition.

See the daylight saving time page for transition dates across every time zone.