Default JSON encoder handles datetime.date objects.

[jfinkels]

Flask's default JSON encoder handles only datetime.datetime objects (via Werkzeug's http_date function). It should also handle datetime.date objects, a common data type that occurs in JSON used to represent dates in backend models.

[chason]

Should this be a fix in Werkzeug's http_date function instead of here?

[jfinkels]

In werkzeug, the function is used specifically for the HTTP header Date, which expects a specific format (in Python terms, it expects a datetime string formatted in a particular way). When returning a JSON response, no specific format for a date object is expected, so I think this should be a feature handled by Flask, not by werkzeug.

[mitsuhiko]

Date objects are dangerous because they don't contain any timezone information. I'm not going to land a change like this unless someone has a really good explanation of why it's necessary :)