Homework endpoint returning invalid ISO 8601 string

[davidcorbin]

Expected Behavior

The due parameter of the response for open assignments through the homework API endpoint is sometimes invalid.

Actual Behavior

When the day is a single digit, the API responds with a single digit date rather than a zero-padded date.

Steps to Reproduce the Problem

1. The due parameter for an assignment due on 2018-04-03T23:55:00Z responds 2018-04-3T23:55:00Z.

Specifications

• Version: Latest
• Platform: All