diff --git a/system/helpers/date_helper.php b/system/helpers/date_helper.php
index 8c92fdc..49dbdbe 100644
--- a/system/helpers/date_helper.php
+++ b/system/helpers/date_helper.php
@@ -5,9 +5,9 @@
  * An open source application development framework for PHP 5.1.6 or newer
  *
  * NOTICE OF LICENSE
- * 
+ *
  * Licensed under the Open Software License version 3.0
- * 
+ *
  * This source file is subject to the Open Software License (OSL 3.0) that is
  * bundled with this package in the files license.txt / license.rst.  It is
  * also available through the world wide web at this URL:
@@ -96,14 +96,14 @@
 	{
 		if ($datestr == '')
 		{
-			return '';			
+			return '';
 		}
 
 		$time = ($time == '') ? now() : $time;
 
 		$datestr = str_replace(
-			'%\\', 
-			'', 
+			'%\\',
+			'',
 			preg_replace("/([a-z]+?){1}/i", "\\\\\\1", $datestr)
 		);
 
@@ -181,15 +181,15 @@
 		$seconds = ($time <= $seconds) ? 1 : $time - $seconds;
 
 		$str = '';
-		$years = floor($seconds / 31536000);
+		$years = floor($seconds / 31557600);
 
 		if ($years > 0)
 		{
 			$str .= $years.' '.$CI->lang->line((($years	> 1) ? 'date_years' : 'date_year')).', ';
 		}
 
-		$seconds -= $years * 31536000;
-		$months = floor($seconds / 2628000);
+		$seconds -= $years * 31557600;
+		$months = floor($seconds / 2629743);
 
 		if ($years > 0 OR $months > 0)
 		{
@@ -198,7 +198,7 @@
 				$str .= $months.' '.$CI->lang->line((($months	> 1) ? 'date_months' : 'date_month')).', ';
 			}
 
-			$seconds -= $months * 2628000;
+			$seconds -= $months * 2629743;
 		}
 
 		$weeks = floor($seconds / 604800);
@@ -315,13 +315,13 @@
 		{
 			$time = time();
 		}
-		
+
 		return mktime(
-			gmdate("H", $time), 
-			gmdate("i", $time), 
-			gmdate("s", $time), 
-			gmdate("m", $time), 
-			gmdate("d", $time), 
+			gmdate("H", $time),
+			gmdate("i", $time),
+			gmdate("s", $time),
+			gmdate("m", $time),
+			gmdate("d", $time),
 			gmdate("Y", $time)
 		);
 	}
@@ -494,17 +494,17 @@
 
 			if (substr($ampm, 0, 1) == 'p' AND $hour < 12)
 			{
-				$hour = $hour + 12;				
+				$hour = $hour + 12;
 			}
 
 			if (substr($ampm, 0, 1) == 'a' AND $hour == 12)
 			{
 				$hour =  '00';
 			}
-			
+
 			if (strlen($hour) == 1)
 			{
-				$hour = '0'.$hour;				
+				$hour = '0'.$hour;
 			}
 		}
 
@@ -517,7 +517,7 @@
 /**
  * Turns many "reasonably-date-like" strings into something
  * that is actually useful. This only works for dates after unix epoch.
- * 
+ *
  * @access  public
  * @param   string  The terribly formatted date-like string
  * @param   string  Date format to return (same as php date function)
@@ -525,7 +525,7 @@
  */
 if ( ! function_exists('nice_date'))
 {
-	function nice_date($bad_date = '', $format = FALSE) 
+	function nice_date($bad_date = '', $format = FALSE)
 	{
 		if (empty($bad_date))
 		{
@@ -533,47 +533,47 @@
 		}
 
 		// Date like: YYYYMM
-		if (preg_match('/^\d{6}$/', $bad_date)) 
+		if (preg_match('/^\d{6}$/', $bad_date))
 		{
-			if (in_array(substr($bad_date, 0, 2),array('19', '20'))) 
+			if (in_array(substr($bad_date, 0, 2),array('19', '20')))
 			{
 				$year  = substr($bad_date, 0, 4);
 				$month = substr($bad_date, 4, 2);
-			} 
-			else 
+			}
+			else
 			{
 				$month  = substr($bad_date, 0, 2);
 				$year   = substr($bad_date, 2, 4);
 			}
-			
+
 			return date($format, strtotime($year . '-' . $month . '-01'));
 		}
-		
+
 		// Date Like: YYYYMMDD
-		if (preg_match('/^\d{8}$/',$bad_date)) 
+		if (preg_match('/^\d{8}$/',$bad_date))
 		{
 			$month = substr($bad_date, 0, 2);
 			$day   = substr($bad_date, 2, 2);
 			$year  = substr($bad_date, 4, 4);
-			
+
 			return date($format, strtotime($month . '/01/' . $year));
 		}
-		
+
 		// Date Like: MM-DD-YYYY __or__ M-D-YYYY (or anything in between)
 		if (preg_match('/^\d{1,2}-\d{1,2}-\d{4}$/',$bad_date))
-		{ 
+		{
 			list($m, $d, $y) = explode('-', $bad_date);
 			return date($format, strtotime("{$y}-{$m}-{$d}"));
 		}
-		
+
 		// Any other kind of string, when converted into UNIX time,
 		// produces "0 seconds after epoc..." is probably bad...
 		// return "Invalid Date".
 		if (date('U', strtotime($bad_date)) == '0')
-		{ 
+		{
 			return "Invalid Date";
 		}
-		
+
 		// It's probably a valid-ish date format already
 		return date($format, strtotime($bad_date));
 	}
@@ -688,9 +688,9 @@
 		{
 			return $zones;
 		}
-		
+
 		$tz = ($tz == 'GMT') ? 'UTC' : $tz;
-		
+
 		return ( ! isset($zones[$tz])) ? 0 : $zones[$tz];
 	}
 }
diff --git a/user_guide_src/source/changelog.rst b/user_guide_src/source/changelog.rst
index 74c29a5..44c9432 100644
--- a/user_guide_src/source/changelog.rst
+++ b/user_guide_src/source/changelog.rst
@@ -73,6 +73,7 @@
 -  Fixed bugs (#157 and #174) - the Image_lib clear() function now resets all variables to their default values.
 -  Fixed a bug where using $this->dbforge->create_table() with PostgreSQL database could lead to fetching whole table.
 -  Bug #795 - Fixed form method and accept-charset when passing an empty array.
+-  Bug #797 - timespan was using incorrect seconds for year and month.
 
 Version 2.1.0
 =============