MST to LHST Converter

Standard business hours (9 AM–5 PM, Mon–Fri) in Mountain Time and Lord Howe Time don't overlap on the same weekday. Lord Howe Time is 17 hours ahead of Mountain Time.

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

• 3 PM–8 PM in Mountain Time (7 AM–12 PM the next day in Lord Howe Time) — suggest 5:00 PM Mountain Time (9:30 AM 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.

Mountain Time is also known as MST, or MDT. To call United States, dial +1.

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

Lord Howe Time is approximately 7,850 miles west of Mountain Time.

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

Mountain Time: next transition on Sunday, November 1, 2026.

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

Mountain 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.