What is the time difference between AST and PDT?

PDT is 3h 0m behind AST. AST is UTC-4 and PDT is UTC-7.

Does AST change for daylight saving time?

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

PDT is 3h 0m behind AST. When it's 12:00 PM AST, it's 9:00 AM PDT.

From

AST · UTC-4

12:09:47AM

Atlantic Standard Time

PDT · UTC-7

9:09:47PM

Pacific Daylight Time

9:00 AM AST=6:00 AM PDT

12:00 PM AST=9:00 AM PDT

5:00 PM AST=2:00 PM PDT

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

What is the time difference between AST and PDT?: PDT is 3h 0m behind AST. AST is UTC-4 and PDT is UTC-7.
What is 12:00 PM AST in PDT?: 12:00 PM AST is 9:00 AM PDT.
Does AST change for daylight saving time?: AST is a fixed offset of UTC-4 and does not itself change for daylight saving time.