Only change year to book_year when it is about a new timesheet. If the...

Only change year to book_year when it is about a new timesheet. If the timesheet already exists use its date.

addedit.php

@@ -133,11 +133,10 @@ $period = new CDate();
 if (intval($obj->timesheet_period)) {
     $period->setDate($obj->timesheet_period,DATE_FORMAT_UNIXTIME);
 } else {
-    $obj->timesheet_period = $period->getTime();
-}
-// Set the correct year
-if ( $config_options['book_year']['value'] != '' ) {
+    // Set the correct year
+    if ( $config_options['book_year']['value'] != '' ) {
         $period->setYear( intval($config_options['book_year']['value']) );
+    }
     $obj->timesheet_period = $period->getTime();
 }