From 5b1d73d4f7ef68f26b2f51b21d06add7895702fb Mon Sep 17 00:00:00 2001
From: Janusz Dobrowolski <janusz@frontaccouting.eu>
Date: Sat, 26 Mar 2011 10:44:44 +0100
Subject: [PATCH] Fixed negative values processing in add_months()

---
 includes/date_functions.inc | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/includes/date_functions.inc b/includes/date_functions.inc
index ee37f00..e4b2c76 100644
--- a/includes/date_functions.inc
+++ b/includes/date_functions.inc
@@ -267,9 +267,9 @@ function add_months($date, $months) // accepts negative values as well
 	global $date_system;
     list($day, $month, $year) = explode_date_to_dmy($date);
 
-	$month += $months;
-	$year += ($month-1)/12;
-	$month = ($month-1)%12 + 1;
+	$months += $year*12+$month;
+	$month = ($months-1)%12+1;
+	$year = ($months-$month)/12;
 
    	$timet = mktime(0,0,0, $month, min($day, days_in_month($month, $year)), $year);
 	
-- 
2.30.2