GST to JST Converter
Understanding GST and JST Time Zones
Gulf Standard Time (GST)
Gulf Standard Time is observed in undefined and uses the offset UTC+4. Major cities in this time zone include Dubai, Abu Dhabi, Doha. This time zone serves a significant global region with important economic and cultural hubs.
Japan Standard Time (JST)
Japan Standard Time operates at UTC+9, covering undefined. Key cities include Tokyo, Osaka, Yokohama. The 5-hour forward offset from GST means that when professionals in Dubai start their workday at 9:00 AM, it is already 2:00 PM in Tokyo.
GST is also commonly referred to as Dubai time, Gulf time, UAE time. JST is also known as Japan time, Tokyo time, Japanese time. So if you are searching for Dubai time to Japan time, this is the same conversion as GST to JST.
Complete GST to JST Conversion Table
The table below shows every two-hour increment converted from Gulf Standard Time to Japan Standard Time. Business hours (9 AM – 5 PM) are highlighted for easy scheduling reference.
| GST (Gulf Standard Time) | JST (Japan Standard Time) |
|---|---|
| 12:00 AM (00:00) | 5:00 AM (05:00) |
| 2:00 AM (02:00) | 7:00 AM (07:00) |
| 4:00 AM (04:00) | 9:00 AM (09:00) |
| 6:00 AM (06:00) | 11:00 AM (11:00) |
| 8:00 AM (08:00) | 1:00 PM (13:00) |
| 10:00 AM (10:00) | 3:00 PM (15:00) |
| 12:00 PM (12:00) | 5:00 PM (17:00) |
| 2:00 PM (14:00) | 7:00 PM (19:00) |
| 4:00 PM (16:00) | 9:00 PM (21:00) |
| 6:00 PM (18:00) | 11:00 PM (23:00) |
| 8:00 PM (20:00) | 1:00 AM (01:00) (next day) |
| 10:00 PM (22:00) | 3:00 AM (03:00) (next day) |
Times shown in 12-hour and 24-hour format. Last updated 2026-03-09.
Scheduling Between GST and JST
Freelancers and contractors working across GST and JST should clearly state their invoicing time zone. A 5-hour difference means an "end of business day" deliverable could mean very different things to each party.
The moderate 5-hour gap between GST and JST means that there is a partial overlap of business hours. Teams can typically find a 3–4 hour window that works for both sides without requiring anyone to work outside normal hours.
Travel Between Dubai and Tokyo
For layover planning between undefined and undefined destinations, connecting flights often involve intermediate time zones. Use our converter to verify each leg independently to avoid missed connections.
Medical experts recommend allowing approximately one day of adjustment per hour of time difference. For the 5-hour shift between GST and JST, plan for about 5 days to fully acclimate.
Daylight Saving Time Considerations
Some regions within a time zone do not observe DST. Arizona (MST) and Hawaii (HST) stay on standard time year-round, which can create unexpected offsets with neighboring states during summer months.
For the GST to JST conversion specifically: GST (UTC+4) and JST (UTC+9) neither observes DST, so the 5-hour offset remains constant throughout the year. This makes scheduling reliable and predictable.
Related Time Zone Conversions
References & Resources
Frequently Asked Questions
GST (Gulf Standard Time) is 5 hours behind JST (Japan Standard Time). GST is UTC+4 and JST is UTC+9.
When it is 12:00 PM (noon) in GST, it is 5:00 PM in JST.
The best overlap for business hours is approximately 2:00 PM to 10:00 PM JST, which corresponds to 9:00 AM to 5:00 PM in GST.
Some regions within a time zone do not observe DST. Arizona (MST) and Hawaii (HST) stay on standard time year-round, which can create unexpected offsets with neighboring states during summer months.