diff --git a/legacy/elementary/ChangeLog b/legacy/elementary/ChangeLog
index 32747d082c..c118914331 100644
--- a/legacy/elementary/ChangeLog
+++ b/legacy/elementary/ChangeLog
@@ -1390,3 +1390,7 @@
 2013-06-05 ChunEon Park (Hermet)
 
         * Fix navifame to recover the focus for the prev page when top item is deleted.
+
+2013-06-06 Ryuan Choi (ryuan)
+
+        * Up/down step of hour decimal of elm_clock is changed to 12 not to touch hour unit at editing mode.
diff --git a/legacy/elementary/NEWS b/legacy/elementary/NEWS
index 5765b91870..369b44997e 100644
--- a/legacy/elementary/NEWS
+++ b/legacy/elementary/NEWS
@@ -238,6 +238,7 @@ Fixes:
    * Fix elm_mapbuf to be enabled before it's content is entirely rendered once.     this will reduce the cases that content is not updated in the screen.
    * Fix elm_colorselector does not update color bar when picker changed color.
    * Fix navifame to recover the focus for the prev page when top item is deleted.
+   * Up/down step of hour decimal of elm_clock is changed to 12 not to touch hour unit at editing mode.
 
 Removals:
 
diff --git a/legacy/elementary/src/lib/elm_clock.c b/legacy/elementary/src/lib/elm_clock.c
index b49fea6556..12887ca352 100644
--- a/legacy/elementary/src/lib/elm_clock.c
+++ b/legacy/elementary/src/lib/elm_clock.c
@@ -31,7 +31,7 @@ _on_clock_val_up(void *data)
    if (!sd->sel_obj) goto clock_val_up_cancel;
    if (sd->sel_obj == sd->digit[0])
      {
-        sd->hrs = sd->hrs + 10;
+        sd->hrs = sd->hrs + 12;
         if (sd->hrs >= 24) sd->hrs -= 24;
      }
    if (sd->sel_obj == sd->digit[1])
@@ -87,7 +87,7 @@ _on_clock_val_down(void *data)
    if (!sd->sel_obj) goto clock_val_down_cancel;
    if (sd->sel_obj == sd->digit[0])
      {
-        sd->hrs = sd->hrs - 10;
+        sd->hrs = sd->hrs - 12;
         if (sd->hrs < 0) sd->hrs += 24;
      }
    if (sd->sel_obj == sd->digit[1])