GMT to HST Converter
HST is 10 hours behind GMT
GMT to HST Conversion Table
Green rows indicate standard business hours (9 AM – 5 PM) in HST
| GMT | HST |
|---|---|
| 12:00 AM | 2:00 PM -1d |
| 1:00 AM | 3:00 PM -1d |
| 2:00 AM | 4:00 PM -1d |
| 3:00 AM | 5:00 PM -1d |
| 4:00 AM | 6:00 PM -1d |
| 5:00 AM | 7:00 PM -1d |
| 6:00 AM | 8:00 PM -1d |
| 7:00 AM | 9:00 PM -1d |
| 8:00 AM | 10:00 PM -1d |
| 9:00 AM | 11:00 PM -1d |
| 10:00 AM | 12:00 AM |
| 11:00 AM | 1:00 AM |
| 12:00 PM | 2:00 AM |
| 1:00 PM | 3:00 AM |
| 2:00 PM | 4:00 AM |
| 3:00 PM | 5:00 AM |
| 4:00 PM | 6:00 AM |
| 5:00 PM | 7:00 AM |
| 6:00 PM | 8:00 AM |
| 7:00 PM | 9:00 AM |
| 8:00 PM | 10:00 AM |
| 9:00 PM | 11:00 AM |
| 10:00 PM | 12:00 PM |
| 11:00 PM | 1:00 PM |
Converting Greenwich Mean Time to Hawaii Standard Time
Greenwich Mean Time (GMT) and Hawaii Standard Time (HST) are separated by a 10 hours time difference. HST is 10 hours behind GMT. GMT is UTC+0, used in United Kingdom, Ireland, Portugal, while HST is UTC-10, used in United States.
When converting from GMT to HST, the key reference points to remember are: 9:00 AM GMT equals 11:00 PM HST, 12:00 PM noon GMT equals 2:00 AM HST, and 5:00 PM GMT equals 7:00 AM HST. The conversion table above shows every hour of the day mapped between these two time zones.
Scheduling Across GMT and HST
For professionals scheduling meetings between GMT and HST, finding overlapping business hours is essential. Standard business hours are typically 9:00 AM to 5:00 PM in each time zone. Given the 10 hours difference, the window of overlap may be limited, making early morning or late evening calls necessary for one party. Use the highlighted working hours in the conversion table above to quickly identify suitable meeting times.
Daylight Saving Time Considerations
GMT observes Daylight Saving Time, switching to BST (UTC+1) during summer months. HST does not observe DST, staying at UTC-10 year-round. During DST transitions, the time difference between these zones may temporarily change by 1 hour. Always verify the current offset during spring and fall transition periods.