Dates should use ISO8601 format

When consulting one page: https://lintian.debian.org/sources/python-grpc-tools

One can read:

The run started on 4/21/2021, 12:29:38 PM and took 9 seconds.

There are several issues with this date format:

• Using 12h with AM/PM instead of 24h format
• Using English date notation mm/dd/yyyy instead of standardized format yyyy-mm-dd
• Missing timezone information: is this date UTC or based on another timezone?

The ISO 8601 equivalent date would be less ambiguous for every non-English native speaker, and standardized.

Expected output would be:

The run started on 2021-04-21T12:29:38Z and took 9 seconds.

Please let me know if any additional information is needed.