created_on in filter api functions as updated_on

GET {{/2.0/repositories/

/

/pullrequests}} with query: {{created_on >=

}} returns Pull Requests objects with their created_on property before the requested date.

Apparently it mistreats the parameter as updated_on and returns Pull Requests last updated after the date rather than created since then.

On a related note, the documentation boldly claims to require ISO-8601 date string, but then fails on a string like this: 2018-04-05T10:09:09.973Z with Invalid filter query expression: Illegal character in input: \'Z\', line: 1, error