More Flexible Calendar Search Date Formats

[rfultz]

What we’re after

I'd like to be able to use calendar-dates queries with date formats that aren't exactly mm/dd/YYYY or YYYY-mm-dd, specifically I'd like ISO8601 format YYYY-mm-ddTHH:MM:SS[+|-]HH:MM not to be rejected.
Optionally, YYYY-mm-ddTHH:MM:SSZ or YYYYmmddTHHMMSSZ

For this specific use case (Fullcalendar), changing our format validation from a strictly equals to a starts with would work fine, i.e. if we evaluated only what's before the T.

Possible complications: do we want to apply the expanded format to other date validations?

These are under /dates/. I definitely need those under /calendar-dates/

/dates/
  /v1/calendar-dates/
    min_start_date
    min_end_date
    max_start_date
    max_end_date
  /v1/calendar-dates-export/ ?
    min_start_date
    min_end_date
    max_start_date
    max_end_date
  /v1/election-dates/
    min_election_date (the Swagger interface doesn't specify a format)
    max_election_date (the Swagger interface doesn't specify a format)
    min_create_date
    max_create_date
    min_update_date
    max_update_date
    min_primary_general_date
    max_primary_general_date
  /v1/reporting-dates/
    min_due_date
    max_due_date
    min_create_date
    max_create_date
    min_update_date
    max_update_date

Related ticket(s)

None

Action item(s)

(These are the smaller tasks that should happen in order to complete this work)

• [ ]

Completion criteria

• Current date formats are still valid (with the new one, as decided)

• Querying with start and dates in the ISO formats returns results as expected (without errors)
  /v1/calendar-dates/?per_page=500&min_start_date=2024-12-01T00%3A00%3A00-05%3A00&max_start_date=2025-01-01T00%3A00%3A00-05%3A00
  returns the same results as
  /v1/calendar-dates/?per_page=500&min_start_date=2024-12-01&max_start_date=2025-01-01

References/resources/technical considerations

(Is there sample code or a screenshot you can include to highlight a particular issue? Here is where you reinforce why this work is important)