Don't pass nanosecond when user passes datetime.date

Author: mroeschke

Diff for: pandas/_libs/tslibs/conversion.pyx

@@ -301,7 +301,7 @@ cdef convert_to_tsobject(object ts, object tz, object unit,
     elif PyDate_Check(ts):
         # Keep the converter same as PyDateTime's
         ts = datetime.combine(ts, datetime_time())
-        return convert_datetime_to_tsobject(ts, tz, nanos)
+        return convert_datetime_to_tsobject(ts, tz)
     elif getattr(ts, '_typ', None) == 'period':
         raise ValueError("Cannot convert Period to Timestamp "
                          "unambiguously. Use to_timestamp")

Diff for: pandas/tests/scalar/timestamp/test_timestamp.py

@@ -8,7 +8,7 @@
 
 from dateutil.tz import tzutc
 from pytz import timezone, utc
-from datetime import datetime, timedelta, date
+from datetime import datetime, timedelta
 
 import pandas.util.testing as tm
 import pandas.util._test_decorators as td
@@ -387,7 +387,6 @@ def test_constructor_fromordinal(self):
 
     @pytest.mark.parametrize('result', [
         Timestamp(datetime(2000, 1, 1), nanosecond=1),
-        Timestamp(date(2000, 1, 1), nanosecond=1),
         Timestamp(year=2000, month=1, day=1, nanosecond=1),
         Timestamp(year=2000, month=1, day=1, tz='UTC', nanosecond=1),
         Timestamp(2000, 1, 1, 0, 0, 0, 0, None, 1),