What is the datetime format for flask-restful parser?

Kinda late, but I've just been in the same problem, trying to parse a datetime with RequestParser, and sadly the docs are not so helpful for this scenario, so after seeing and testing RequestParser and Argument code, I think I found the problem:

When you use type=datetime in the add_argument method, under the hood it just calls datetime with the arg, like this: datetime(arg), so if your param is a string like this: 2016-07-12T23:13:3, the error will be an integer is required.

In my case, I wanted to parse a string with this format %Y-%m-%dT%H:%M:%S into a datetime object, so I thought to use something like type=datetime.strptime but as you know this method needs a format parameter, so I finally used this workaround:

parser.add_argument('date', type=lambda x: datetime.strptime(x,'%Y-%m-%dT%H:%M:%S'))

As you can see in this way you can use whatever format datetime you want. Also you can use partial functool instead of lambda to get the same result or a named function.

This workaround is in the docs.

Just an update on Flask-Restful (0.3.5): it is possible to use the own library date and datetime functionality parsing, if ISO 8601 or RFC 822 suffices:

from flask_restful import inputsparser.add_argument('date', type=inputs.datetime_from_iso8601)

So the request would be,

curl --data "date=2012-01-01T23:30:00+02:00" localhost:5000/myGet

From the docs