diff --git a/atomfeedgen.py b/atomfeedgen.py
index aaafc25..2471517 100755
--- a/atomfeedgen.py
+++ b/atomfeedgen.py
@@ -61,7 +61,7 @@ for cl in changelogData.split("\n\n"):
     print(firstLine)
     date, semVersion = firstLine.split("Version")
     semVersion  = semVersion.strip()
-    isodate = datetime.fromisoformat(date.strip())
+    isodate = fromisoformat(date.strip())
     isodate = isodate.replace(tzinfo=ZoneInfo("UTC"))