diff --git a/holonote/annotate/display.py b/holonote/annotate/display.py
index 82ece5bd..793963eb 100644
--- a/holonote/annotate/display.py
+++ b/holonote/annotate/display.py
@@ -343,7 +343,8 @@ def _filter_stream_values(self, bounds, x, y, geometry):
         if not self._editable_enabled:
             return (None, None, None, None)
         if self.region_format == "point" and bounds:
-            x = (bounds[0] + bounds[2]) / 2
+            #  x is calculated this way to handle datetime
+            x = bounds[0] + (bounds[2] - bounds[0]) / 2
             y = None
             bounds = (x, 0, x, 0)
         elif "range" not in self.region_format: