diff --git a/rowers/interactiveplots.py b/rowers/interactiveplots.py
index 4cf5c33a..282894bd 100644
--- a/rowers/interactiveplots.py
+++ b/rowers/interactiveplots.py
@@ -748,8 +748,9 @@ def fitnessmetric_chart(fitnessmetrics,user,workoutmode='rower',startdate=None,
             power2k = power2k,
             date = date,
             power1hr = power1hr,
-            fdate=groups['dates'].map(lambda x: x.strftime('%d-%m-%Y'))            )
+            fdate=groups['dates'].map(lambda x: x.strftime('%Y-%m-%d'))
         )
+    )
 
 
     # fit