JST to AST

Japan Standard Time

Japan Standard Time (JST)

JST is 9 hours ahead of Universal Time (UTC+9)

↑ ↓

Atlantic Standard Time

Atlantic Standard Time (AST)

AST is 4 hours behind Universal Time (UTC-4)

JST to AST Time Conversion

When it is 12:00 PM in JST, it is 11:00 PM the previous day in AST.

📞There is no overlap during standard 9-to-5 business hours, so a call may need to be early or late in the day for one side.

Time difference between JST and AST

JST is 13 hours ahead of AST.

🕐 Subtract 13 hours from JST time to get AST time.

JST uses 9 hours ahead of Universal Time (UTC+9) and AST uses 4 hours behind Universal Time (UTC-4).

JST to AST time conversion chart (24 hours)

Highlighted rows are overlapping 9-to-5 business hours – the best time to schedule a call between JST and AST.

JST Time		AST Time
12 AM JST Time	↔	11 AM AST Time
1 AM JST Time	↔	12 PM AST Time
2 AM JST Time	↔	1 PM AST Time
3 AM JST Time	↔	2 PM AST Time
4 AM JST Time	↔	3 PM AST Time
5 AM JST Time	↔	4 PM AST Time
6 AM JST Time	↔	5 PM AST Time
7 AM JST Time	↔	6 PM AST Time
8 AM JST Time	↔	7 PM AST Time
9 AM JST Time	↔	8 PM AST Time
10 AM JST Time	↔	9 PM AST Time
11 AM JST Time	↔	10 PM AST Time

JST Time		AST Time
12 PM JST Time	↔	11 PM AST Time
1 PM JST Time	↔	12 AM AST Time
2 PM JST Time	↔	1 AM AST Time
3 PM JST Time	↔	2 AM AST Time
4 PM JST Time	↔	3 AM AST Time
5 PM JST Time	↔	4 AM AST Time
6 PM JST Time	↔	5 AM AST Time
7 PM JST Time	↔	6 AM AST Time
8 PM JST Time	↔	7 AM AST Time
9 PM JST Time	↔	8 AM AST Time
10 PM JST Time	↔	9 AM AST Time
11 PM JST Time	↔	10 AM AST Time

JST to AST - Frequently Asked Questions

Q

What is the time difference between JST and AST?

A

JST is 13 hours ahead of AST.

Q

Is JST ahead of or behind AST?

A

JST is ahead of AST by 13 hours.

Q

When it is 9:00 AM in JST, what time is it in AST?

A

It is 8:00 PM the previous day in AST.

Convert JST Time to Popular Time Zones

Convert Time in Popular Time Zones to AST