Fix datetime.utcnow deprecation warnings (#1162)

ariadne/contrib/tracing/apollotracing.py

@@ -1,4 +1,3 @@
-from datetime import datetime
 from inspect import iscoroutinefunction
 from typing import Any, List, Optional, cast
 
@@ -20,6 +19,19 @@ def perf_counter_ns() -> int:
  return int(perf_counter() * NS_IN_SECOND)
 
 
+try:
+ from datetime import UTC, datetime # type: ignore[attr-defined]
+
+ def utc_now():
+ return datetime.now(UTC)
+
+except ImportError:
+ from datetime import datetime
+
+ def utc_now():
+ return datetime.utcnow()
+
+
 TIMESTAMP_FORMAT = "%Y-%m-%dT%H:%M:%S.%fZ"
 
 
@@ -33,7 +45,7 @@ def __init__(self, trace_default_resolver: bool = False) -> None:
  self._totals = None
 
  def request_started(self, context: ContextValue):
- self.start_date = datetime.utcnow()
+ self.start_date = utc_now()
  self.start_timestamp = perf_counter_ns()
 
  def resolve(self, next_: Resolver, obj: Any, info: GraphQLResolveInfo, **kwargs):
@@ -93,7 +105,7 @@ def get_totals(self):
  def _get_totals(self):
  return {
  "start": self.start_date,
- "end": datetime.utcnow(),
+ "end": utc_now(),
  "duration": perf_counter_ns() - self.start_timestamp,
  "resolvers": self.resolvers,
  }