How many hours is UTC behind LHST?
As abbreviations, LHST is always 10.5 hours ahead of UTC: UTC is UTC+0 and LHST is UTC+10:30. To convert, add 10.5 hours.
Check which label you actually need: LHST (Lord Howe Time is on UTC+11 today). A time written with an abbreviation that is not in use is usually meant as the local time, so convert between the places instead: right now LHST is 11 hours ahead of UTC.
When the UTC to LHST time difference changes
For most of the year LHST is 11 hours ahead of UTC. From 4 April to 2 October 2027, LHST is 10.5 hours ahead of UTC instead, because the two places change their clocks on different dates. Meetings booked by the usual gap land an hour off in those weeks.
| Dates | LHST vs UTC | Length |
|---|---|---|
| 4 October 2026 to 31 December 2026 | 11 hours ahead | 89 days |
| 1 January 2027 to 3 April 2027 | 11 hours ahead | 93 days |
| 4 April 2027 to 2 October 2027 | 10.5 hours ahead | 182 days |
| 3 October 2027 to 31 December 2027 | 11 hours ahead | 90 days |
When UTC and LHST are both at work
- When LHST is 11 hours ahead of UTC: no shared 09:00 to 17:00 hours; try 07:00 in UTC (18:00 in LHST).
- When LHST is 10.5 hours ahead of UTC: no shared 09:00 to 17:00 hours; try 07:00 in UTC (17:30 in LHST).