HST to UTC Converter

UTC is 10 hours ahead of HST

Current HST Time

--:--:-- --

Pacific/Honolulu

Current UTC Time

--:--:-- --

Etc/UTC

Time Diff

10h ahead

HST

UTC-10

UTC

UTC+0

HST to UTC Conversion Table

Green rows indicate standard business hours (9 AM – 5 PM) in UTC

HST to UTC time conversion table showing all 24 hours
HST	UTC
12:00 AM 00:00	10:00 AM 10:00	Business hours
1:00 AM 01:00	11:00 AM 11:00	Business hours
2:00 AM 02:00	12:00 PM 12:00	Business hours
3:00 AM 03:00	1:00 PM 13:00	Business hours
4:00 AM 04:00	2:00 PM 14:00	Business hours
5:00 AM 05:00	3:00 PM 15:00	Business hours
6:00 AM 06:00	4:00 PM 16:00	Business hours
7:00 AM 07:00	5:00 PM 17:00
8:00 AM 08:00	6:00 PM 18:00
9:00 AM 09:00	7:00 PM 19:00
10:00 AM 10:00	8:00 PM 20:00
11:00 AM 11:00	9:00 PM 21:00
12:00 PM 12:00	10:00 PM 22:00
1:00 PM 13:00	11:00 PM 23:00
2:00 PM 14:00	12:00 AM 00:00 +1d	Next day
3:00 PM 15:00	1:00 AM 01:00 +1d	Next day
4:00 PM 16:00	2:00 AM 02:00 +1d	Next day
5:00 PM 17:00	3:00 AM 03:00 +1d	Next day
6:00 PM 18:00	4:00 AM 04:00 +1d	Next day
7:00 PM 19:00	5:00 AM 05:00 +1d	Next day
8:00 PM 20:00	6:00 AM 06:00 +1d	Next day
9:00 PM 21:00	7:00 AM 07:00 +1d	Next day
10:00 PM 22:00	8:00 AM 08:00 +1d	Next day
11:00 PM 23:00	9:00 AM 09:00 +1d	Next day

Converting Hawaii Standard Time to Coordinated Universal Time

Hawaii Standard Time (HST) and Coordinated Universal Time (UTC) are separated by a 10 hours time difference. UTC is 10 hours ahead of HST. HST is UTC-10, used in United States, while UTC is UTC+0.

When converting from HST to UTC, the key reference points to remember are: 9:00 AM HST equals 7:00 PM UTC, 12:00 PM noon HST equals 10:00 PM UTC, and 5:00 PM HST equals 3:00 AM UTC. The conversion table above shows every hour of the day mapped between these two time zones.

Scheduling Across HST and UTC

For professionals scheduling meetings between HST and UTC, 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

HST does not observe Daylight Saving Time, maintaining UTC-10 year-round. UTC does not observe DST, staying at UTC+0 year-round.

Frequently Asked Questions

What is the time difference between HST and UTC?

Coordinated Universal Time (UTC) is 10 hours ahead of Hawaii Standard Time (HST). When it is 12:00 PM noon in HST, it is 10:00 PM in UTC.

How do I convert HST to UTC?

To convert HST to UTC, add 10 hours to the HST time. For example, 9:00 AM HST is 7:00 PM UTC. Use the conversion table above for a quick reference of all 24 hours.

Does HST or UTC observe Daylight Saving Time?

HST does not observe Daylight Saving Time. UTC does not observe Daylight Saving Time. During DST transitions, the time difference between these zones may change by 1 hour.

What is the best time to schedule a call between HST and UTC?

The best time to schedule a call between HST and UTC is during overlapping business hours. If you are in HST, try scheduling between 9:00 AM and 5:00 PM your time, then check the conversion table above to see what that corresponds to in UTC.

Is HST ahead or behind UTC?

HST (UTC-10) is 10 hours behind UTC (UTC+0). HST corresponds to the IANA time zone Pacific/Honolulu, while UTC corresponds to Etc/UTC.

Related Conversions

Reverse: UTC to HST