diff --git a/ecowitt2mqtt/helpers/calculator/time.py b/ecowitt2mqtt/helpers/calculator/time.py
index 2598883f..5fcb43cd 100644
--- a/ecowitt2mqtt/helpers/calculator/time.py
+++ b/ecowitt2mqtt/helpers/calculator/time.py
@@ -1,8 +1,6 @@
 """Define time calculators."""
 from __future__ import annotations
 
-from datetime import datetime, timezone
-
 from ecowitt2mqtt.const import TIME_SECONDS
 from ecowitt2mqtt.helpers.calculator import (
     CalculatedDataPoint,
@@ -11,6 +9,7 @@
     SimpleCalculator,
 )
 from ecowitt2mqtt.helpers.typing import PreCalculatedValueType
+from ecowitt2mqtt.util.dt import utc_from_timestamp
 
 
 class EpochCalculator(Calculator):
@@ -33,7 +32,7 @@ def calculate_from_value(
         if isinstance(value, str):
             raise CalculationFailedError("Cannot parse value as datetime")
 
-        timestamp = datetime.utcfromtimestamp(value).replace(tzinfo=timezone.utc)
+        timestamp = utc_from_timestamp(value)
         return self.get_calculated_data_point(timestamp)
 
 
diff --git a/ecowitt2mqtt/util/dt.py b/ecowitt2mqtt/util/dt.py
new file mode 100644
index 00000000..9cd7431f
--- /dev/null
+++ b/ecowitt2mqtt/util/dt.py
@@ -0,0 +1,22 @@
+"""Define datetime utilities."""
+from datetime import datetime
+
+try:
+    from datetime import UTC
+except ImportError:
+    # In place for support of Python 3.10
+    from datetime import timezone
+
+    UTC = timezone.utc
+
+
+def utc_from_timestamp(timestamp: float) -> datetime:
+    """Return a UTC time from a timestamp.
+
+    Args:
+        timestamp: The epoch to convert.
+
+    Returns:
+        A parsed ``datetime.datetime`` object.
+    """
+    return datetime.fromtimestamp(timestamp, tz=UTC)
diff --git a/pyproject.toml b/pyproject.toml
index 8d133baf..b9b44e7f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -6,7 +6,7 @@ build-backend = "poetry.core.masonry.api"
 target-version = ["py39"]
 
 [tool.coverage.report]
-exclude_lines = ["TYPE_CHECKING", "NotImplementedError", "handle_exit_signal"]
+exclude_lines = ["TYPE_CHECKING", "ImportError", "NotImplementedError", "handle_exit_signal"]
 fail_under = 100
 show_missing = true
 
@@ -31,7 +31,7 @@ ignore_missing_imports = true
 no_implicit_optional = true
 platform = "linux"
 plugins = ["pydantic.mypy"]
-python_version = "3.10"
+python_version = "3.12"
 show_error_codes = true
 strict_equality = true
 warn_incomplete_stub = true