UTC to HST Converter & Meeting Planner
Quick answer: 9:00 AM UTC = 11:00 PM HST (fixed +00:00 standard offset — not DST-adjusted). Use the interactive converter below for DST-aware local-time scheduling.
Planning a call or meeting between Coordinated Universal Time (UTC) and Hawaii-Aleutian Standard Time (HST)? You need to account for the standard time difference. Hawaii-Aleutian Standard Time is normally 10 hours behind Coordinated Universal Time. Whether you are coordinating between teams in Greenwich / London and Honolulu and Hilo, our live tool has you covered. Use our interactive overlap studio below to find the perfect waking hours for both regions, taking into account any seasonal Daylight Saving Time (DST) changes.
24-Hour Conversion Table
Quick reference: 12:00 AM UTC = 2:00 PM HST. The full 24-hour UTC to HST table below uses fixed standard offsets for exact abbreviation searches.
Example: 3:00 PM UTC = 5:00 AM HST.
| UTC Time | HST Time |
|---|---|
| 12:00 AM (00:00) | 2:00 PM (14:00)-1 day |
| 1:00 AM (01:00) | 3:00 PM (15:00)-1 day |
| 2:00 AM (02:00) | 4:00 PM (16:00)-1 day |
| 3:00 AM (03:00) | 5:00 PM (17:00)-1 day |
| 4:00 AM (04:00) | 6:00 PM (18:00)-1 day |
| 5:00 AM (05:00) | 7:00 PM (19:00)-1 day |
| 6:00 AM (06:00) | 8:00 PM (20:00)-1 day |
| 7:00 AM (07:00) | 9:00 PM (21:00)-1 day |
| 8:00 AM (08:00) | 10:00 PM (22:00)-1 day |
| 9:00 AM (09:00) | 11:00 PM (23:00)-1 day |
| 10:00 AM (10:00) | 12:00 AM (00:00) |
| 11:00 AM (11:00) | 1:00 AM (01:00) |
| 12:00 PM (12:00) | 2:00 AM (02:00) |
| 1:00 PM (13:00) | 3:00 AM (03:00) |
| 2:00 PM (14:00) | 4:00 AM (04:00) |
| 3:00 PM (15:00) | 5:00 AM (05:00) |
| 4:00 PM (16:00) | 6:00 AM (06:00) |
| 5:00 PM (17:00) | 7:00 AM (07:00) |
| 6:00 PM (18:00) | 8:00 AM (08:00) |
| 7:00 PM (19:00) | 9:00 AM (09:00) |
| 8:00 PM (20:00) | 10:00 AM (10:00) |
| 9:00 PM (21:00) | 11:00 AM (11:00) |
| 10:00 PM (22:00) | 12:00 PM (12:00) |
| 11:00 PM (23:00) | 1:00 PM (13:00) |
Best time to call Honolulu from Greenwich / London
For most work calls, compare the normal business day in Greenwich / London (UTC) with the business day in Honolulu (HST). UTC commonly covers Global, while HST is mainly associated with Pacific Ocean, North America.
⚠️ Note: 2026-07-05 is not a normal workday in one or both regions based on their configured calendar. The overlap below should be treated as a reference, not a guaranteed office-hours window.
⚠️ There is no clean same-day business-hours overlap on 2026-07-05. A practical compromise is around 7:00 PM UTC, which reaches 9:00 AM HST near the start of their workday.
- DST Safety: UTC or HST may shift during Daylight Saving Time. Always confirm the converted time for your specific date.
🔥 Popular UTC & HST Converters
Frequently searched time zone conversions related to your search.
Related Time Converters
Explore nearby time zone offsets and reverse conversions related to UTC and HST.
Frequently Asked Questions
What is the time difference between UTC and HST?
During standard time, Hawaii-Aleutian Standard Time is 10 hours behind Coordinated Universal Time.
Does Hawaii observe Daylight Saving Time?
Hawaii does not observe Daylight Saving Time and has not done so since 1947, remaining fixed at UTC-10:00 year-round. At roughly 20° North latitude, Hawaii's daylight hours vary by only about 1.5 hours between the summer and winter solstices — far too little to justify the disruption of a seasonal clock change.
Why is it called Hawaii-Aleutian time?
The name combines two geographically distant US territories that share the same UTC-10:00 standard offset: the Hawaiian Islands in the central Pacific and the westernmost Aleutian Islands of Alaska, which extend past the 180° meridian into the Eastern Hemisphere. Despite sharing a base offset, they behave differently — Hawaii observes no DST, while the Aleutian communities such as Adak do advance to HDT (UTC-9) each summer.