diff --git a/singertools/infer_schema.py b/singertools/infer_schema.py
index 3ace8b8..20cce2e 100755
--- a/singertools/infer_schema.py
+++ b/singertools/infer_schema.py
@@ -29,8 +29,9 @@ def add_observations(acc, path, data):
     elif isinstance(data, str):
         # If the string parses as a date, add an observation that its a date
         try:
-            data = dateutil.parser.parse(data)
-        except (dateutil.parser.ParserError, OverflowError):
+            # Parse it as an ISO-8601 date to avoid some kinds of false positives
+            data = dateutil.parser.isoparse(data)
+        except (dateutil.parser.ParserError, OverflowError, ValueError):
             data = None
         if data:
             add_observation(acc, path + ["date"])