Do what was meant to happen in #22838

scripts/FilterEvents/eventFilterGUI.py

@@ -713,7 +713,7 @@ class MainWindow(QtGui.QMainWindow):
         vectimes = numpy.append(vectimes,tf)
         vecvalue = numpy.append(vecvalue, vecvalue[-1])
 
-        vecreltimes = (t - t0) / numpy.timedelta64(1, 's')
+        vecreltimes = (vectimes - t0) / numpy.timedelta64(1, 's')
 
         # Set to plot
         xlim = [vecreltimes.min(), vecreltimes.max()]