California to GST time conversion
GST is 11 hours ahead of California. After the next clock change (): GST is 12 hours ahead of California.
Time difference with your location
California is 7 hours behind UTC. Compare with your local time →
Choose a date and time
Choose the local time in California to convert it to GST on that date.
Skipped clock-change times are unavailable; a repeated time uses its first occurrence.
24-hour conversion chart · California → GST
This table converts each hour in California to GST on 2026-10-21.
- Working hours
- Outside working hours
- Night hours
| California | GST | Shared working hours |
|---|---|---|
| 00:0012:00 AM | 11:0011:00 AM | |
| 01:001:00 AM | 12:0012:00 PM | |
| 02:002:00 AM | 13:001:00 PM | |
| 03:003:00 AM | 14:002:00 PM | |
| 04:004:00 AM | 15:003:00 PM | |
| 05:005:00 AM | 16:004:00 PM | |
| 06:006:00 AM | 17:005:00 PM | |
| 07:007:00 AM | 18:006:00 PM | |
| 08:008:00 AM | 19:007:00 PM | |
| 09:009:00 AM | 20:008:00 PM | |
| 10:0010:00 AM | 21:009:00 PM | |
| 11:0011:00 AM | 22:0010:00 PM | |
| 12:0012:00 PM | 23:0011:00 PM | |
| 13:001:00 PM | 00:0012:00 AM +1 day | |
| 14:002:00 PM | 01:001:00 AM +1 day | |
| 15:003:00 PM | 02:002:00 AM +1 day | |
| 16:004:00 PM | 03:003:00 AM +1 day | |
| 17:005:00 PM | 04:004:00 AM +1 day | |
| 18:006:00 PM | 05:005:00 AM +1 day | |
| 19:007:00 PM | 06:006:00 AM +1 day | |
| 20:008:00 PM | 07:007:00 AM +1 day | |
| 21:009:00 PM | 08:008:00 AM +1 day | |
| 22:0010:00 PM | 09:009:00 AM +1 day | |
| 23:0011:00 PM | 10:0010:00 AM +1 day |
Quick conversion examples
These examples use California (UTC-7) and GST (UTC+4); choosing a date applies the local clock changes.
Conversion formula: GST = California + 11h · California + 12h.
| California | GST |
|---|---|
| 6:00 AM California | = 5:00 PM GST |
| 7:00 AM California | = 6:00 PM GST |
| 8:00 AM California | = 7:00 PM GST |
| 9:00 AM California | = 8:00 PM GST |
| 10:00 AM California | = 9:00 PM GST |
| 12:00 PM California | = 11:00 PM GST |
| 3:00 PM California | = 2:00 AM GST (+1 day) |
| 5:00 PM California | = 4:00 AM GST (+1 day) |
| 6:00 PM California | = 5:00 AM GST (+1 day) |
| 8:00 PM California | = 7:00 AM GST (+1 day) |
Overlapping meeting hours
The 08:00–18:00 working days in California and GST do not overlap on 2026-10-21.
Clock changes on both sides, 2026–2028
California and GST have the following local clock changes in 2026–2028; all times in the table are local to that side.
| Year | California | GST |
|---|---|---|
| 2026 | · 02:00 → 03:00 · 02:00 → 01:00 | No clock changes; UTC+4 all year. |
| 2027 | · 02:00 → 03:00 · 02:00 → 01:00 | No clock changes; UTC+4 all year. |
| 2028 | · 02:00 → 03:00 · 02:00 → 01:00 | No clock changes; UTC+4 all year. |
At the start of 2026, GST is 12 hours ahead of California. The difference changes during the following periods.
- From 2026-03-08 03:00 California until 2026-11-01 01:00 California, GST is 11 hours ahead of California.
- From 2027-03-14 03:00 California until 2027-11-07 01:00 California, GST is 11 hours ahead of California.
- From 2028-03-12 03:00 California until 2028-11-05 01:00 California, GST is 11 hours ahead of California.
Frequently asked questions
What time is 9 AM California in GST?
9:00 AM California = 8:00 PM GST, using UTC-7 and UTC+4. Choose a date above for the seasonal local time.
Does the time difference between California and GST change during the year?
Yes. During 2026–2028: GST is 11 hours ahead of California; GST is 12 hours ahead of California. The clock-change table gives the dates for both sides.
How do I tell whether it is day or night in GST?
Read the GST clock above: this guide counts 06:00–18:00 local time as daytime and the rest as nighttime, without using sunrise and sunset.
What is the best time to call between California and GST?
The 08:00–18:00 working days in California and GST do not overlap.
What is the time difference between California and GST now?
Right now, GST is 11 hours ahead of California. Conversion formula: GST = California + 11h · California + 12h.