edwardwang888 opened a new pull request #18343:
URL: https://github.com/apache/airflow/pull/18343


   This test uses the current time and a sleep to test retry delay. However, 
this is nondeterministic and fails on my local machine as it takes longer than 
3 seconds to execute the first two runs. I think the reason for this was that 
the code was originally written using `datetime.datetime.now` (see 
https://github.com/apache/airflow/commit/8051aa988d315ab5c54bf5dd8f6e931356c07c2e#diff-969c0712020e8472d8d78ae32190692cc1e8a3e16dc17f6977c8f87a1328adb7R163),
 which cannot be easily patched without affecting other parts of the code that 
use `datetime.datetime`. However, now that there is the `timezone.utc` 
function, patching is possible. The downside is that we need to duplicate the 
logic, though it is only two lines.
   
https://github.com/apache/airflow/blob/87e98652d58198e4ef7146bdc7e1e8d87a7d2bae/airflow/utils/timezone.py#L53-L65
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