[Core feature] Add type transformer for datetime.date

[dennisobrien]

Motivation: Why do you think this is important?

Flyte currently does not support the datetime.date object for passing to or from tasks.

ValueError: Type <class 'datetime.date'> not supported currently in Flytekit. Please register a new transformer

In flytekit/core/type_engine.py there are transformers for datetime.datetime and datetime.timedelta, but not for datetime.date.

Goal: What should the final outcome look like, ideally?

Flyte tasks should be able to accept and return datetime.date objects.

Describe alternatives you've considered

The workaround is to use a datetime.datetime or to use a string of the form "YYYY-MM-DD".

Propose: Link/Inline OR Additional context

No response

Are you sure this issue hasn't been raised already?

• Yes

Have you read the Code of Conduct?

• Yes

[samhita-alla]

@eapolinario

[eapolinario]

This is a good first issue as it'll touch a few of the components, at least flyteidl (to add the new field) and flytekit.

[troychiu]

Hi @eapolinario @samhita-alla ,
I am interested in this issue. If you think it still needs to be fixed, feel free to assign it to me.

[pingsutw]

@dennisobrien FYI. The PR has been merged.