[BUG] [typescript-fetch] Parameters with format: date are treated like date-time instead

Description

If I specify a request with a date parameter, with type: string and format: date, then according to relevant documentation, this should be formatted as "2017-07-21", but it is instead formatted as "2017-07-21T17:32:28Z".

openapi-generator version

org.openapi.generator version 6.6.0
using the typescript-fetch generator.

OpenAPI declaration file content or url

parameters:
  name: startDate
  in: query
  schema:
    type: string
    format: date

Generation Details

Steps to reproduce

Simply generate any client with above snippet and look at the output or call the client with any Date object.

Suggest a fix

The generated code does:

queryParameters["startDate"] = (requestParameters.startDate as any).toISOString();

where it should be doing:

queryParameters["startDate"] = requestParameters.startDate.toISOString().split('T')[0];

No repository file or test is named. Generate a typescript-fetch client from the provided YAML parameter and inspect the generated query serialization shown in the report. Done means a parameter with format: date is serialized as a date-only value such as "2017-07-21", rather than date-time output.