diff --git a/shared/libretime_shared/datetime.py b/shared/libretime_shared/datetime.py
new file mode 100644
index 000000000..ab06eeba3
--- /dev/null
+++ b/shared/libretime_shared/datetime.py
@@ -0,0 +1,14 @@
+from datetime import time
+
+
+def time_in_seconds(value: time) -> float:
+    return (
+        value.hour * 60 * 60
+        + value.minute * 60
+        + value.second
+        + value.microsecond / 1000000.0
+    )
+
+
+def time_in_milliseconds(value: time) -> float:
+    return time_in_seconds(value) * 1000
diff --git a/shared/tests/datetime_test.py b/shared/tests/datetime_test.py
new file mode 100644
index 000000000..2c75e58db
--- /dev/null
+++ b/shared/tests/datetime_test.py
@@ -0,0 +1,15 @@
+from datetime import time
+
+from pytest import approx
+
+from libretime_shared.datetime import time_in_milliseconds, time_in_seconds
+
+
+def test_time_in_seconds():
+    value = time(hour=0, minute=3, second=34, microsecond=649600)
+    assert time_in_seconds(value) == approx(214.65, abs=0.009)
+
+
+def test_time_in_milliseconds():
+    value = time(hour=0, minute=0, second=0, microsecond=500000)
+    assert time_in_milliseconds(value) == 500