Get a schedule - Rendered Schedule Entries empty

[thombrooks]

Summary:
If 'since' and 'until' parameters are just a few microseconds apart, the rendered schedule may be empty. If they match exactly, we get a rendered schedule as expected.

Explanation / How to reproduce:
We use 'get a schedule' to determine which person is working at a specific time and date. We wrote a function that takes the Team ID, and (optionally) the 'since' and 'until' parameters. If the user did not specify values for 'since' or 'until', we were getting the current datetime as ISO 8601 including microseconds... making TWO calls, one per parameter. The call failed sometimes but not others.

When we modified our function to get the current datetime ONCE, and then substituted in that one value when either parameter was not explicitly passed in, the functionality worked as expected.