JST to AST Time Converter
Use this JST to AST time converter to compare Japan and Canada time instantly. AST is 13 hours behind JST, so 9:00 AM JST becomes 8:00 PM (previous day) AST and 5:00 PM JST becomes 4:00 AM AST. 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 AST Quick Facts
Use this JST to AST converter to compare Japan and Canada time, check the 13 hours gap, and confirm the right slot for calls, handoffs, and deadlines. Find the best overlap for calls and meetings.
How to Convert JST to AST
Converting between Japan Standard Time and Atlantic Standard Time means accounting for a 13 hours 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 Atlantic Standard Time (UTC -4) time appears immediately. Since AST is 13 hours behind of JST, conversions often cross midnight — look for the date-change label.
Click "Copy Time" to grab the AST result for your calendar or message. Use "+1d" to check how the conversion shifts across dates — helpful for scheduling recurring Japan–Canada calls.
Why Choose Our JST to AST Converter
With 13 hours between JST and AST, business-hours overlap is limited. This tool instantly shows which hours work on both sides, so you can lock in a meeting without a chain of "does 3 PM work for you?" emails.
A JST evening at 9 PM is already the previous afternoon in AST. This converter flags date changes beside the result — critical when booking flights, hitting deadlines, or scheduling across the Japan–Canada corridor.
Daylight Saving adjustments can widen or narrow the JST–AST 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 AST so you know exactly when to tune in — with a 13 hours difference, a morning event in Japan hits the evening in Canada.
JST to AST Time Conversion Chart
Quick-reference conversion table covering every hour of the day at a glance.
Japan Standard Time to Atlantic Standard Time full day schedule
| Japan Standard Time | Atlantic Standard Time |
|---|---|
| 12:00 AM |
11:00 AM
(previous day)
|
| 1:00 AM |
12:00 PM
(previous day)
|
| 2:00 AM |
1:00 PM
(previous day)
|
| 3:00 AM |
2:00 PM
(previous day)
|
| 4:00 AM |
3:00 PM
(previous day)
|
| 5:00 AM |
4:00 PM
(previous day)
|
| 6:00 AM |
5:00 PM
(previous day)
|
| 7:00 AM |
6:00 PM
(previous day)
|
| 8:00 AM |
7:00 PM
(previous day)
|
| 9:00 AM |
8:00 PM
(previous day)
|
| 10:00 AM |
9:00 PM
(previous day)
|
| 11:00 AM |
10:00 PM
(previous day)
|
| 12:00 PM |
11:00 PM
(previous day)
|
| 1:00 PM |
12:00 AM
|
| 2:00 PM |
1:00 AM
|
| 3:00 PM |
2:00 AM
|
| 4:00 PM |
3:00 AM
|
| 5:00 PM |
4:00 AM
|
| 6:00 PM |
5:00 AM
|
| 7:00 PM |
6:00 AM
|
| 8:00 PM |
7:00 AM
|
| 9:00 PM |
8:00 AM
|
| 10:00 PM |
9:00 AM
|
| 11:00 PM |
10:00 AM
|
Popular JST Time Converters
Explore more JST conversions for major business and travel corridors. Each page includes a 24-hour chart, time difference summary, and meeting overlap guidance.
Convert Other Time Zones to AST
Find the time difference from any major zone into Atlantic Standard Time. Use these pages when scheduling with Canada from a different region.