diff -Naur WebCalendar-1.2.0.orig/edit_entry_handler.php WebCalendar-1.2.0.new/edit_entry_handler.php
--- WebCalendar-1.2.0.orig/edit_entry_handler.php	2008-07-02 02:49:02.000000000 +0200
+++ WebCalendar-1.2.0.new/edit_entry_handler.php	2008-12-05 18:57:05.000000000 +0100
@@ -703,6 +703,12 @@
     if ( empty ( $rem_before ) )
       $rem_before = 'Y';
 
+    // If entry has changed, reset the reminder.
+    if ($entry_changed) {
+      $rem_last_sent = '0';
+      $rem_times_sent = '0';
+    }
+
     if ( empty ( $rem_last_sent ) )
       $rem_last_sent = '0';