Checklist

• I have checked the issues list
  for similar or identical enhancement to an existing feature.
• I have checked the pull requests list
  for existing proposed enhancements.
• I have checked the commit log
  to find out if the if the same enhancement was already implemented in the
  main branch.
• I have included all related issues and possible duplicate issues in this issue
  (If there are none, check this box anyway).

Related Issues and Possible Duplicates

Related Issues

• None

Possible Duplicates

• None

Brief Summary

celery.utils.iso8601 is historic module which .parse_iso8601() can be replaced by datetime.datetime.fromisoformat() as Python 3.7 or above is now supported.

Suggest deprecate this module and use datetime.datetime.fromisoformat() internally.

Design

Architectural Considerations

None

Proposed Behavior

• iso8601 module is still usable before v6.0.0, but with addition of deprecation warning
• remove iso8601 module in v6.0.0
• replace all usage of parse_iso8601() in the library by datetime.datetime.fromisoformat, with compatibility of Python 3.7 to 3.11

Proposed UI/UX

N/A

Diagrams

N/A

Alternatives

None