Closes issue #23600: Wrong results from tzinfo.fromutc().

diff --cc Lib/test/datetimetester.py
Simple merge

diff --cc Misc/NEWS
index 1e13f63483a8fabd2d5352a70e4bf2158ffebfde,aa59f158469d793e82815e1e4cd4fe75c7e27511..0797dd2295c69fd62f1f237874828e7676135d73
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -21,8 -81,8 +21,11 @@@ Core and Builtin
  Library
  -------
  
 -  wrong results in some cases. 
+ - Issue #23600: Default implementation of tzinfo.fromutc() was returning
++  wrong results in some cases.
++
 +- Issue #23329: Allow the ssl module to be built with older versions of
 +  LibreSSL.
  
  - Prevent overflow in _Unpickler_Read.
  

diff --cc Modules/_datetimemodule.c
Simple merge