diff --git a/scripts/unify-sources.sh b/scripts/unify-sources.sh
--- a/scripts/unify-sources.sh
+++ b/scripts/unify-sources.sh
@@ -1,8 +1,17 @@
 #!/bin/bash
 
-YEAR=`date +2003-%Y`
+YEAR=`date +%Y`
 HGROOT=`hg root`
 
+function hg_year() {
+    if [ -n "$(hg st $1)" ]; then
+        echo $YEAR
+    else
+        hg log -l 1 --template='{date|isodate}\n' $1 |
+        cut -d '-' -f 1
+    fi
+}
+
 function update_header() {
     TMP_FILE=`mktemp`
     FILE_NAME=$1
@@ -11,7 +20,7 @@
  *
  * This file is a part of LEMON, a generic C++ optimization library.
  *
- * Copyright (C) "$YEAR"
+ * Copyright (C) 2003-"$(hg_year $1)"
  * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
  * (Egervary Research Group on Combinatorial Optimization, EGRES).
  *