From the second test, it looks like ClockInDate is of type Edm.DateTimeOffset. The following might help (TBH- i didnt fully read it)
Edit
From another site:
“…try to pass on DateTimeOffset using a JSON format in the query string, like 2014-05-06T22:24:55Z, that should work.”
For example
http://localhost:1234/api/values/1?date=2017-04-17T05:45:18.070Z
Try adding the time portion, like T00:00:00Z