GMT to PST Converter – Greenwich Mean Time to Pacific Time
12:00 PM GMT = 4:00 AM PST
When it is noon Greenwich Mean Time (GMT), it is 4:00 AM PST (Thu) in Pacific Time. The difference is −8 hours in January and −7 hours in July.
Step by step
- Find the time difference: PST is −8 hours relative to GMT (January).
- Add or subtract that many hours from the GMT time.
- Check daylight saving: in July the difference is −7 hours.
- If the result passes midnight, the date changes too.
Hour by hour (January): 12:00 AM GMT → 4:00 PM PST (Wed); 3:00 AM GMT → 7:00 PM PST (Wed); 6:00 AM GMT → 10:00 PM PST (Wed); 8:00 AM GMT → 12:00 AM PST (Thu); 9:00 AM GMT → 1:00 AM PST (Thu); 12:00 PM GMT → 4:00 AM PST (Thu); 3:00 PM GMT → 7:00 AM PST (Thu); 5:00 PM GMT → 9:00 AM PST (Thu); 6:00 PM GMT → 10:00 AM PST (Thu); 9:00 PM GMT → 1:00 PM PST (Thu). During daylight saving time, PST becomes PDT.
Details
- GMT zone
- Greenwich Mean Time (UTC)
- PST zone
- Pacific Time (America/Los_Angeles)
- Difference in winter
- −8 hours
- Difference in summer
- −7 hours
- 9 AM GMT is
- 1:00 AM PST (Thu)
- 5 PM GMT is
- 9:00 AM PST (Thu)
How it works
Time zones are offsets from Coordinated Universal Time (UTC). Many people say “EST” or “PST” all year, but strictly EST and PST are standard time; during US daylight saving time (second Sunday in March to first Sunday in November) clocks use EDT and PDT. Countries such as Pakistan, India and Japan do not use daylight saving time, so their difference from US time changes twice a year. The converter above uses the official time zone database, so it is correct for any date.
Nearby values
| Conversion | Time difference |
|---|---|
| PST to UTC | +8 hours (winter) / +7 hours (summer) |
| UTC to CST | −6 hours (winter) / −5 hours (summer) |
| GMT to EST | −5 hours (winter) / −4 hours (summer) |
| EST to GMT | +5 hours (winter) / +4 hours (summer) |
| GMT to PST | −8 hours (winter) / −7 hours (summer) |
| IST to EST | −10.5 hours (winter) / −9.5 hours (summer) |
| EST to IST | +10.5 hours (winter) / +9.5 hours (summer) |
| IST to PST | −13.5 hours (winter) / −12.5 hours (summer) |
| PST to IST | +13.5 hours (winter) / +12.5 hours (summer) |
Related conversions
Frequently asked questions
What time is it in PST when it is noon GMT?
4:00 AM PST (Thu) in winter.
How many hours difference is GMT to PST?
−8 hours in January and −7 hours in July.
What is 9 AM GMT in PST?
1:00 AM PST (Thu) (winter).
Does GMT to PST change with daylight saving?
Yes — the difference changes when one zone observes daylight saving time and the other does not, or they switch on different dates.