JST to CHST Time Converter
Use this JST to CHST time converter to compare Japan and Chamorro Standard Time time instantly. CHST is 1 hour ahead of JST, so 9:00 AM JST becomes 10:00 AM CHST and 5:00 PM JST becomes 6:00 PM CHST. The page is useful for business-hours overlap, international calls, remote-team handoffs, webinars, and travel planning, with daylight saving adjustments handled automatically.
JST to ChST Quick Facts
Use this JST to CHST converter to compare Japan and Chamorro Standard Time time, check the 1 hour gap, and confirm the right slot for calls, handoffs, and deadlines. Good overlap starts around 9:00 AM JST / 10:00 AM CHST.
How to Convert JST to ChST
Converting between Japan Standard Time and Chamorro Standard Time means accounting for a 1 hour gap — here's how to do it in under 10 seconds with no sign-up.
Pick the date and time in Japan Standard Time (UTC +9) that you want to convert. Hit "Now" to load the current JST time instantly, or use "+1h" to step forward and compare.
The equivalent Chamorro Standard Time (UTC +10) time appears immediately. Since ChST is 1 hour ahead of JST, most daytime conversions stay on the same calendar day.
Click "Copy Time" to grab the ChST result for your calendar or message. Use "+1d" to check how the conversion shifts across dates — useful when Daylight Saving Time changes the gap.
Why Choose Our JST to ChST Converter
When someone in Japan suggests 9:00 AM JST, that's 10:00 AM ChST. This converter shows the overlap so both sides agree on one slot — no back-and-forth.
Late-night JST times can land on a different date in ChST because of the 1 hour offset. The converter labels "next day" or "previous day" next to the result so you never send a message a day early or miss a deadline.
Daylight Saving adjustments can widen or narrow the JST–ChST gap by an hour. During transition weeks many people get it wrong. This converter pulls the current UTC offsets automatically, so the result is right even on the changeover day.
Product launches, sports matches, and webinars are often announced in JST. Convert the event time to ChST so you know exactly when to tune in — with a 1 hour difference, a morning event in Japan falls during work hours in ChST.
JST to ChST Time Conversion Chart
Quick-reference conversion table covering every hour of the day at a glance.
Japan Standard Time to Chamorro Standard Time full day schedule
| Japan Standard Time | Chamorro Standard Time |
|---|---|
| 12:00 AM |
1:00 AM
|
| 1:00 AM |
2:00 AM
|
| 2:00 AM |
3:00 AM
|
| 3:00 AM |
4:00 AM
|
| 4:00 AM |
5:00 AM
|
| 5:00 AM |
6:00 AM
|
| 6:00 AM |
7:00 AM
|
| 7:00 AM |
8:00 AM
|
| 8:00 AM |
9:00 AM
|
| 9:00 AM |
10:00 AM
|
| 10:00 AM |
11:00 AM
|
| 11:00 AM |
12:00 PM
|
| 12:00 PM |
1:00 PM
|
| 1:00 PM |
2:00 PM
|
| 2:00 PM |
3:00 PM
|
| 3:00 PM |
4:00 PM
|
| 4:00 PM |
5:00 PM
|
| 5:00 PM |
6:00 PM
|
| 6:00 PM |
7:00 PM
|
| 7:00 PM |
8:00 PM
|
| 8:00 PM |
9:00 PM
|
| 9:00 PM |
10:00 PM
|
| 10:00 PM |
11:00 PM
|
| 11:00 PM |
12:00 AM
(next day)
|
Timezone offsets and DST rules verified against the IANA Time Zone Database. Conversion math and business-hour overlap windows double-checked against real-world scheduling scenarios.
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