diff --git a/teamstation.py b/teamstation.py
index df2a3fd..e1da67e 100644
--- a/teamstation.py
+++ b/teamstation.py
@@ -120,6 +120,10 @@ class TeamstationBot( CurrentPageBot ):  # sets 'current_page' on each treat()
                 # Get value of param 1
                 jahre = occ.get(1);
 
+                # Normalize rarely used "bis 2000" notation
+                if "bis" in jahre.value:
+                    jahre.value.replace("bis", "{{0|0000}}\u2013")
+
                 # Get parts of value
                 mo = re.search(r"\s*(\{\{0\|0000\}\}|(?:1|2)\d{3})\s*(–|‐|-|‑|‒|—|―|˗)?\s*((?:1|2)\d{3})?",str(jahre.value))