[BUG] Can't compare offset-naive and offset-aware datetimes

[xhuang-jpl]

Describe the bug

Try to run the troposphere delay using the HRES dataset, and the function below raises the "can't compare offset-naive and offset-aware datetimes" error because of the missing time zone.

RAiDER/tools/RAiDER/models/hres.py

Line 70 in 0c0a6aa

if self._time < dt.datetime(2013, 6, 26, 0, 0, 0):

RAiDER Version
0.5.3