HST to GMT Time Converter - Live World Clock

Convert time between Hawaii Standard Time (HST) and Greenwich Mean Time (GMT). See current time with live clocks.

United States (HST)

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07:27:45 AM
Thursday, August 20, 2026

United Kingdom (GMT)

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06:27:45 PM
Thursday, August 20, 2026

Current Time Difference

HST is -10 hours behind GMT

What is HST (Hawaii Standard Time)?

Hawaii Standard Time (HST) used in Hawaii, UTC-10:00. No DST observed.

Countries and Regions Using HST

Primary Country:

  • United States
  • States: Hawaii

Key Facts about HST:

  • ✓ No Daylight Saving Time
  • ✓ Major tourism destination
  • ✓ Pacific island timezone
  • ✓ Major Cities: Honolulu, Pearl City, Hilo
  • ✓ UTC Offset: -10:00

What is GMT (Greenwich Mean Time)?

Greenwich Mean Time (GMT) is the reference point for world time zones, UTC+0:00.

Countries and Regions Using GMT

Primary Country:

  • United Kingdom

Also Used By:

  • Ireland
  • Portugal

Key Facts about GMT:

  • ✓ Prime meridian reference point
  • ✓ London financial center
  • ✓ Historical timekeeping standard
  • ✓ Major Cities: London, Manchester, Birmingham, Leeds, Glasgow
  • ✓ UTC Offset: +0:00 (+1:00 during BST)

HST to GMT Time Difference

Standard Time Difference:

HST is -10 hours behind

Common Use Cases:

  • • Business meetings between United States and United Kingdom
  • • International collaboration across timezones
  • • Scheduling calls and conferences

Frequently Asked Questions

Which countries are in HST time zone?

United States is the primary country using HST (-10:00).

Which countries are in GMT time zone?

United Kingdom is the primary country using GMT (+0:00). Other countries include: Ireland, Portugal.

How many hours is HST ahead of GMT?

HST is -10 hours behind GMT.

Does United States observe Daylight Saving Time?

No, United States does not observe Daylight Saving Time. HST remains -10:00 throughout the year.