add tests and asv

Author: quangngd

asv_bench/benchmarks/timeseries.py

@@ -336,14 +336,30 @@ def time_infer_quarter(self):
 
 class ToDatetimeFormat:
     def setup(self):
-        self.s = Series(["19MAY11", "19MAY11:00:00:00"] * 100000)
+        N = 100000
+        self.s = Series(["19MAY11", "19MAY11:00:00:00"] * N)
         self.s2 = self.s.str.replace(":\\S+$", "")
 
+        self.same_offset = ['10/11/2018 00:00:00.045-07:00'] * N
+        self.diff_offset = [f'10/11/2018 00:00:00.045-0{offset}:00' for offset in range(10)] * int(N / 10)
+
     def time_exact(self):
         to_datetime(self.s2, format="%d%b%y")
 
     def time_no_exact(self):
         to_datetime(self.s, format="%d%b%y", exact=False)
+    
+    def time_same_offset(self):
+        to_datetime(self.same_offset, format="%m/%d/%Y %H:%M:%S.%f%z")
+
+    def time_different_offset(self):
+        to_datetime(self.same_offset, format="%m/%d/%Y %H:%M:%S.%f%z")
+
+    def time_same_offset_to_utc(self):
+        to_datetime(self.same_offset, format="%m/%d/%Y %H:%M:%S.%f%z", utc=True)
+
+    def time_different_offset_to_utc(self):
+        to_datetime(self.diff_offset, format="%m/%d/%Y %H:%M:%S.%f%z", utc=True)
 
 
 class ToDatetimeCache:

pandas/tests/tools/test_to_datetime.py

@@ -325,6 +325,8 @@ def test_to_datetime_parse_tzname_or_tzoffset(self, fmt, dates, expected_dates):
 
         # GH 32792
         result = pd.to_datetime(dates, format=fmt, utc=True)
+        expected = pd.Index([date.astimezone('UTC') for date in expected_dates])
+        tm.assert_equal(result, expected)
         assert result.dtype._tz is pytz.UTC
 
     @pytest.mark.parametrize(