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(Prefect <http://2.my|2.0 question) > my flow has a `start_date` parameter. In the flow code the default of this value is set like this
```def sync_circleci(start_date: datetime.date = datetime.datetime.today().date()):
   ...```
and it will come out in the YYYY-MM-DD format. Now when I deploy the flow, it seems that the default value is not recognized by Prefect UI. When I run  this flow "using default param values", the flow fails with this error
```prefect.exceptions.SignatureMismatchError: Function expects parameters ['start_date'] but was provided with parameters []```
which means the default value is not recognized (?).

And when I select a date value using the date picker, looks like the date format is not recognized by my flow code with this error
``` - start_date: invalid date format```
How should I handle this?

thanks for flagging - we are currently investigating and will let you know once we know more

Hi <@U03MHT4KV61> - for your question about setting parameters in the UI - I've opened an issue to look into the datetime.date setting.

Would datetime.datetime work for you in the meantime?

FYI: we'll ship a fix for that with a 2.1.1 release within the next hour or so

thanks Anna.

I have also tried to change the input data type to datetime. the flow now works when I trigger it with a param override.
```def sync_circleci(start_date: datetime.datetime = datetime.datetime.now(pytz.utc)):```
However it still does not recognize the default value

Hi <@U03MHT4KV61> - have you updated to Prefect 2.1.1?

Ah - for default parameters to work you'll need to make the update!