TYP: get_utcoffset (#35107)

Author: jbrockmendel

pandas/_libs/tslibs/timezones.pxd

@@ -1,4 +1,4 @@
-from cpython.datetime cimport tzinfo
+from cpython.datetime cimport datetime, timedelta, tzinfo
 
 cdef tzinfo utc_pytz
 
@@ -11,7 +11,7 @@ cpdef bint tz_compare(tzinfo start, tzinfo end)
 cpdef object get_timezone(tzinfo tz)
 cpdef object maybe_get_tz(object tz)
 
-cdef get_utcoffset(tzinfo tz, obj)
+cdef timedelta get_utcoffset(tzinfo tz, datetime obj)
 cdef bint is_fixed_offset(tzinfo tz)
 
 cdef object get_dst_info(tzinfo tz)

pandas/_libs/tslibs/timezones.pyx

@@ -1,5 +1,5 @@
 from datetime import timezone
-from cpython.datetime cimport datetime, tzinfo
+from cpython.datetime cimport datetime, timedelta, tzinfo
 
 # dateutil compat
 from dateutil.tz import (
@@ -153,7 +153,7 @@ cdef inline object tz_cache_key(tzinfo tz):
 # UTC Offsets
 
 
-cdef get_utcoffset(tzinfo tz, obj):
+cdef timedelta get_utcoffset(tzinfo tz, datetime obj):
     try:
         return tz._utcoffset
     except AttributeError:

pandas/core/arrays/datetimes.py

@@ -3,7 +3,6 @@
 import warnings
 
 import numpy as np
-from pytz import utc
 
 from pandas._libs import lib, tslib
 from pandas._libs.tslibs import (
@@ -725,7 +724,7 @@ def _local_timestamps(self):
         This is used to calculate time-of-day information as if the timestamps
         were timezone-naive.
         """
-        return tzconversion.tz_convert(self.asi8, utc, self.tz)
+        return tzconversion.tz_convert(self.asi8, timezones.UTC, self.tz)
 
     def tz_convert(self, tz):
         """

pandas/tseries/frequencies.py

@@ -4,7 +4,7 @@
 import numpy as np
 
 from pandas._libs.algos import unique_deltas
-from pandas._libs.tslibs import Timestamp
+from pandas._libs.tslibs import Timestamp, tzconversion
 from pandas._libs.tslibs.ccalendar import (
     DAYS,
     MONTH_ALIASES,
@@ -22,7 +22,6 @@
 from pandas._libs.tslibs.parsing import get_rule_month
 from pandas._libs.tslibs.resolution import month_position_check
 from pandas._libs.tslibs.timezones import UTC
-from pandas._libs.tslibs.tzconversion import tz_convert
 from pandas.util._decorators import cache_readonly
 
 from pandas.core.dtypes.common import (
@@ -199,7 +198,7 @@ def __init__(self, index, warn: bool = True):
         # the timezone so they are in local time
         if hasattr(index, "tz"):
             if index.tz is not None:
-                self.i8values = tz_convert(self.i8values, UTC, index.tz)
+                self.i8values = tzconversion.tz_convert(self.i8values, UTC, index.tz)
 
         self.warn = warn