Is it possible to create a cron schedule based on PDT without timezone specified? say, timezone is tied to UTC

Goal: Create a consistent cron expression that fires every Sunday at midnight in PDT. without changing the expression twice a year.

Limitation: Can't specify timezone. all expressions are based on UTC

Background: AWS CloudWatch event supports cron expression but it defaults to UTC.

I believe it is easy in UTC to PST

0 8 * ? SUN *

But, what if I need it to be PDT?