What is the time difference between AST and JST?

JST is 13h 0m ahead of AST. AST is UTC-4 and JST is UTC+9.

What is 12:00 PM AST in JST?

12:00 PM AST is 1:00 AM (+1 day) JST.

AST is a fixed offset of UTC-4 and does not itself change for daylight saving time.

JST is 13h 0m ahead of AST. When it's 12:00 PM AST, it's 1:00 AM (+1 day) JST.

From

AST · UTC-4

12:09:48AM

Atlantic Standard Time

JST · UTC+9

1:09:48PM

Japan Standard Time

9:00 AM AST=10:00 PM JST

12:00 PM AST=1:00 AM(+1 day) JST

5:00 PM AST=6:00 AM(+1 day) JST

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.

What is the time difference between AST and JST?: JST is 13h 0m ahead of AST. AST is UTC-4 and JST is UTC+9.
What is 12:00 PM AST in JST?: 12:00 PM AST is 1:00 AM (+1 day) JST.
Does AST change for daylight saving time?: AST is a fixed offset of UTC-4 and does not itself change for daylight saving time.