diff --git a/ChangeLog b/ChangeLog
index 9970ac89e..16c6ef6e8 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2013-11-13  Vladimir Serbinenko  <phcoder@gmail.com>
+
+	* grub-core/normal/datetime.c (grub_get_weekday): Use if rather than
+	division.
+
 2013-11-13  Vladimir Serbinenko  <phcoder@gmail.com>
 
 	* grub-core/kern/uboot/init.c: Move grub_uboot_machine_type and
diff --git a/grub-core/normal/datetime.c b/grub-core/normal/datetime.c
index 7e548acdf..95b8c9ff5 100644
--- a/grub-core/normal/datetime.c
+++ b/grub-core/normal/datetime.c
@@ -36,7 +36,10 @@ grub_get_weekday (struct grub_datetime *datetime)
 {
   unsigned a, y, m;
 
-  a = (14 - datetime->month) / 12;
+  if (datetime->month <= 2)
+    a = 1;
+  else
+    a = 0;
   y = datetime->year - a;
   m = datetime->month + 12 * a - 2;