TST: incorrect locale specification for datetime format

closes #15215

Author: jreback

pandas/tseries/tests/test_timeseries.py

@@ -5369,7 +5369,13 @@ def test_to_datetime_format_integer(self):
         assert_series_equal(result, expected)
 
     def test_to_datetime_format_microsecond(self):
-        val = '01-Apr-2011 00:00:01.978'
+
+        # these are locale dependent
+        import locale, calendar
+        lang, _ = locale.getlocale()
+        month_abbr = calendar.month_abbr[4]
+        val = '01-{}-2011 00:00:01.978'.format(month_abbr)
+
         format = '%d-%b-%Y %H:%M:%S.%f'
         result = to_datetime(val, format=format)
         exp = datetime.strptime(val, format)