JST to AST Converter

AST is 13h 0m behind JST. When it's 12:00 PM JST, it's 11:00 PM (−1 day) AST.

From

JST · UTC+9

1:09:53PM

Japan Standard Time

e.g. Tokyo

To

AST · UTC-4

12:09:53AM

Atlantic Standard Time

e.g. Halifax, Puerto Rico

Open in World ClockAST → JST
9:00 AM JST=8:00 PM(−1 day) AST
12:00 PM JST=11:00 PM(−1 day) AST
5:00 PM JST=4:00 AM AST

Hourly conversion (JST → AST)

JSTAST
12:00 AM11:00 AM(−1 day)
1:00 AM12:00 PM(−1 day)
2:00 AM1:00 PM(−1 day)
3:00 AM2:00 PM(−1 day)
4:00 AM3:00 PM(−1 day)
5:00 AM4:00 PM(−1 day)
6:00 AM5:00 PM(−1 day)
7:00 AM6:00 PM(−1 day)
8:00 AM7:00 PM(−1 day)
9:00 AM8:00 PM(−1 day)
10:00 AM9:00 PM(−1 day)
11:00 AM10:00 PM(−1 day)
12:00 PM11:00 PM(−1 day)
1:00 PM12:00 AM
2:00 PM1:00 AM
3:00 PM2:00 AM
4:00 PM3:00 AM
5:00 PM4:00 AM
6:00 PM5:00 AM
7:00 PM6:00 AM
8:00 PM7:00 AM
9:00 PM8:00 AM
10:00 PM9:00 AM
11:00 PM10:00 AM

Shaded rows are within standard working hours (8am–6pm) on both sides.

Japan does not observe daylight saving time, so JST (UTC+9) applies year-round.

More JST conversions

Frequently asked questions

What is the time difference between JST and AST?
AST is 13h 0m behind JST. JST is UTC+9 and AST is UTC-4.
What is 12:00 PM JST in AST?
12:00 PM JST is 11:00 PM (−1 day) AST.
Does JST change for daylight saving time?
Japan does not observe daylight saving time, so JST (UTC+9) applies year-round.