Replace deprecated datetime.utcnow() with datetime.now(timezone.utc)

datetime.utcnow() emits DeprecationWarning under Python 3.12+ and is
scheduled for removal in a future version. Switch to the recommended
timezone-aware alternative.

Note: datetime.timezone is Python 3.2+, so this drops Python 2.7
support. Python 2.7 has been EOL since 2020.

Author: jelson

aprslib/parsing/common.py

@@ -1,6 +1,6 @@
 import re
 from math import sqrt
-from datetime import datetime
+from datetime import datetime, timezone
 from aprslib import base91
 from aprslib.exceptions import ParseError
 from aprslib.parsing import logger
@@ -80,7 +80,7 @@ def parse_timestamp(body, packet_type=''):
     match = re.findall(r"^((\d{6})(.))$", body[0:7])
     if match:
         rawts, ts, form = match[0]
-        utc = datetime.utcnow()
+        utc = datetime.now(timezone.utc)
 
         timestamp = 0
 

tests/test_parse_common.py

@@ -1,7 +1,7 @@
 import unittest
 import string
 from random import randint, randrange, sample
-from datetime import datetime
+from datetime import datetime, timezone
 
 from aprslib import base91
 from aprslib.parsing.common import *
@@ -178,8 +178,8 @@ def test_status_timestamp_invalid(self):
             })
 
     def test_timestamp_valid(self):
-        date = datetime.utcnow()
-        td = date - datetime(1970, 1, 1)
+        date = datetime.now(timezone.utc)
+        td = date - datetime(1970, 1, 1, tzinfo=timezone.utc)
         timestamp = int((td.microseconds + (td.seconds + td.days * 24 * 3600) * 10**6) / 10**6)
 
         # hhmmss format