Use timezone-aware datetime objects, for UTC too

datetime.datetime.utcnow() is deprecated in Python 3.12, and it's
recommended to switch to timezone-aware objects, so do this. It also
simplifies local time handling, as .astimezone() method can be used
instead of calculating timezone_delta manually.

Part of saltstack#65604

salt/grains/core.py

@@ -2905,12 +2905,12 @@ def ip_fqdn():
         if not ret["ipv" + ipv_num]:
             ret[key] = []
         else:
-            start_time = datetime.datetime.utcnow()
+            start_time = datetime.datetime.now(tz=datetime.timezone.utc)
             try:
                 info = socket.getaddrinfo(_fqdn, None, socket_type)
                 ret[key] = list({item[4][0] for item in info})
             except (OSError, UnicodeError):
-                timediff = datetime.datetime.utcnow() - start_time
+                timediff = datetime.datetime.now(tz=datetime.timezone.utc) - start_time
                 if timediff.seconds > 5 and __opts__["__role"] == "master":
                     log.warning(
                         'Unable to find IPv%s record for "%s" causing a %s '

salt/state.py

@@ -171,11 +171,9 @@ def _calculate_fake_duration():
     Generate a NULL duration for when states do not run
     but we want the results to be consistent.
     """
-    utc_start_time = datetime.datetime.utcnow()
-    local_start_time = utc_start_time - (
-        datetime.datetime.utcnow() - datetime.datetime.now()
-    )
-    utc_finish_time = datetime.datetime.utcnow()
+    utc_start_time = datetime.datetime.now(tz=datetime.timezone.utc)
+    local_start_time = utc_start_time.astimezone()
+    utc_finish_time = datetime.datetime.now(tz=datetime.timezone.utc)
     start_time = local_start_time.time().isoformat()
     delta = utc_finish_time - utc_start_time
     # duration in milliseconds.microseconds
@@ -2152,7 +2150,7 @@ def _call_parallel_target(cls, instance, init_kwargs, name, cdata, low):
             instance = cls(**init_kwargs)
         # we need to re-record start/end duration here because it is impossible to
         # correctly calculate further down the chain
-        utc_start_time = datetime.datetime.utcnow()
+        utc_start_time = datetime.datetime.now(tz=datetime.zoneinfo.utc)
 
         instance.format_slots(cdata)
         tag = _gen_tag(low)
@@ -2172,10 +2170,9 @@ def _call_parallel_target(cls, instance, init_kwargs, name, cdata, low):
                 "comment": f"An exception occurred in this state: {trb}",
             }
 
-        utc_finish_time = datetime.datetime.utcnow()
-        timezone_delta = datetime.datetime.utcnow() - datetime.datetime.now()
-        local_finish_time = utc_finish_time - timezone_delta
-        local_start_time = utc_start_time - timezone_delta
+        utc_finish_time = datetime.datetime.now(tz=datetime.zoneinfo.utc)
+        local_finish_time = utc_finish_time.astimezone()
+        local_start_time = utc_start_time.astimezone()
         ret["start_time"] = local_start_time.time().isoformat()
         delta = utc_finish_time - utc_start_time
         # duration in milliseconds.microseconds
@@ -2205,8 +2202,8 @@ def _call_parallel_target(cls, instance, init_kwargs, name, cdata, low):
                         *cdata["args"], **cdata["kwargs"]
                     )
 
-                    utc_start_time = datetime.datetime.utcnow()
-                    utc_finish_time = datetime.datetime.utcnow()
+                    utc_start_time = datetime.datetime.now(tz=datetime.timezone.utc)
+                    utc_finish_time = datetime.datetime.now(tz=datetime.timezone.utc)
                     delta = utc_finish_time - utc_start_time
                     duration = (delta.seconds * 1000000 + delta.microseconds) / 1000.0
                     retry_ret["duration"] = duration
@@ -2293,10 +2290,8 @@ def call(self, low, chunks=None, running=None, retries=1):
         Call a state directly with the low data structure, verify data
         before processing.
         """
-        utc_start_time = datetime.datetime.utcnow()
-        local_start_time = utc_start_time - (
-            datetime.datetime.utcnow() - datetime.datetime.now()
-        )
+        utc_start_time = datetime.datetime.now(tz=datetime.timezone.utc)
+        local_start_time = utc_start_time.astimezone()
         log.info(
             "Running state [%s] at time %s",
             low["name"].strip() if isinstance(low["name"], str) else low["name"],
@@ -2485,10 +2480,9 @@ def call(self, low, chunks=None, running=None, retries=1):
         self.__run_num += 1
         format_log(ret)
         self.check_refresh(low, ret)
-        utc_finish_time = datetime.datetime.utcnow()
-        timezone_delta = datetime.datetime.utcnow() - datetime.datetime.now()
-        local_finish_time = utc_finish_time - timezone_delta
-        local_start_time = utc_start_time - timezone_delta
+        utc_finish_time = datetime.datetime.now(tz=datetime.timezone.utc)
+        local_finish_time = utc_finish_time.astimezone()
+        local_start_time = utc_start_time.astimezone()
         ret["start_time"] = local_start_time.time().isoformat()
         delta = utc_finish_time - utc_start_time
         # duration in milliseconds.microseconds

salt/utils/jid.py

@@ -16,7 +16,7 @@ def _utc_now():
     """
     Helper method so tests do not have to patch the built-in method.
     """
-    return datetime.datetime.utcnow()
+    return datetime.datetime.now(tz=datetime.timezone.utc)
 
 
 def gen_jid(opts):

salt/utils/pkg/rpm.py

@@ -130,7 +130,7 @@ def parse_pkginfo(line, osarch=None):
 
     if install_time not in ("(none)", "0"):
         install_date = (
-            datetime.datetime.utcfromtimestamp(int(install_time)).isoformat() + "Z"
+            datetime.datetime.fromtimestamp(int(install_time), datetime.UTC).isoformat() + "Z"
         )
         install_date_time_t = int(install_time)
     else: