diff --git a/library/Icinga/Util/DateTimeFactory.php b/library/Icinga/Util/DateTimeFactory.php
index 17aa72948..9dd854aa7 100644
--- a/library/Icinga/Util/DateTimeFactory.php
+++ b/library/Icinga/Util/DateTimeFactory.php
@@ -91,39 +91,4 @@ class DateTimeFactory implements ConfigAwareFactory
     {
         return new DateTime($time, $timeZone !== null ? $timeZone : self::$timeZone);
     }
-
-    /**
-     * Return the amount of seconds based on the given month
-     *
-     * @param   DateTime    $dateTime   The date and time to use
-     *
-     * @return  int
-     */
-    public static function getSecondsByMonth(DateTime $dateTime)
-    {
-        return (int) $dateTime->format('t') * 24 * 3600;
-    }
-
-    /**
-     * Return the amount of seconds based on the given year
-     *
-     * @param   DateTime    $dateTime   The date and time to use
-     *
-     * @return  int
-     */
-    public static function getSecondsByYear(DateTime $dateTime)
-    {
-        return (self::isLeapYear($dateTime) ? 366 : 365) * 24 * 3600;
-    }
-
-    /**
-     * Return whether the given year is a leap year
-     *
-     * @param   DateTime    $dateTime   The date and time to check
-     * @return  bool
-     */
-    public static function isLeapYear(DateTime $dateTime)
-    {
-        return $dateTime->format('L') == 1;
-    }
 }
diff --git a/library/Icinga/Util/Format.php b/library/Icinga/Util/Format.php
index b6f97ff98..8c55cbafa 100644
--- a/library/Icinga/Util/Format.php
+++ b/library/Icinga/Util/Format.php
@@ -29,6 +29,7 @@
 
 namespace Icinga\Util;
 
+use DateTime;
 use Icinga\Exception\ProgrammingError;
 
 class Format
@@ -150,4 +151,50 @@ class Format
             $units[$pow]
         );
     }
+
+    /**
+     * Return the amount of seconds based on the given month
+     *
+     * @param   DateTime|int    $dateTimeOrTimestamp    The date and time to use
+     *
+     * @return  int
+     */
+    public static function secondsByMonth($dateTimeOrTimestamp)
+    {
+        if (!($dt = $dateTimeOrTimestamp) instanceof DateTime) {
+            $dt = new DateTime();
+            $dt->setTimestamp($dateTimeOrTimestamp);
+        }
+
+        return (int) $dt->format('t') * 24 * 3600;
+    }
+
+    /**
+     * Return the amount of seconds based on the given year
+     *
+     * @param   DateTime|int    $dateTimeOrTimestamp    The date and time to use
+     *
+     * @return  int
+     */
+    public static function secondsByYear($dateTimeOrTimestamp)
+    {
+        return (self::isLeapYear($dateTimeOrTimestamp) ? 366 : 365) * 24 * 3600;
+    }
+
+    /**
+     * Return whether the given year is a leap year
+     *
+     * @param   DateTime|int    $dateTimeOrTimestamp    The date and time to use
+     *
+     * @return  bool
+     */
+    public static function isLeapYear($dateTimeOrTimestamp)
+    {
+        if (!($dt = $dateTimeOrTimestamp) instanceof DateTime) {
+            $dt = new DateTime();
+            $dt->setTimestamp($dateTimeOrTimestamp);
+        }
+
+        return $dt->format('L') == 1;
+    }
 }
diff --git a/modules/monitoring/application/controllers/TimelineController.php b/modules/monitoring/application/controllers/TimelineController.php
index 47917995d..48efe0845 100644
--- a/modules/monitoring/application/controllers/TimelineController.php
+++ b/modules/monitoring/application/controllers/TimelineController.php
@@ -6,6 +6,7 @@ use \DateTime;
 use \DateInterval;
 use \Zend_Config;
 use Icinga\Web\Url;
+use Icinga\Util\Format;
 use Icinga\Application\Config;
 use Icinga\Util\DateTimeFactory;
 use Icinga\Web\Controller\ActionController;
@@ -170,13 +171,13 @@ class Monitoring_TimelineController extends ActionController
             case '1m':
                 $dateCopy = clone $dateTime;
                 for ($i = 0; $i < 6; $i++) {
-                    $dateCopy->sub(new DateInterval('PT' . DateTimeFactory::getSecondsByMonth($dateCopy) . 'S'));
+                    $dateCopy->sub(new DateInterval('PT' . Format::secondsByMonth($dateCopy) . 'S'));
                 }
                 return $dateCopy->add(new DateInterval('PT1S'))->diff($dateTime);
             case '1y':
                 $dateCopy = clone $dateTime;
                 for ($i = 0; $i < 4; $i++) {
-                    $dateCopy->sub(new DateInterval('PT' . DateTimeFactory::getSecondsByYear($dateCopy) . 'S'));
+                    $dateCopy->sub(new DateInterval('PT' . Format::secondsByYear($dateCopy) . 'S'));
                 }
                 return $dateCopy->add(new DateInterval('PT1S'))->diff($dateTime);
             default:
diff --git a/modules/monitoring/library/Monitoring/Timeline/TimeRange.php b/modules/monitoring/library/Monitoring/Timeline/TimeRange.php
index 93c81f98f..7ea4787b8 100644
--- a/modules/monitoring/library/Monitoring/Timeline/TimeRange.php
+++ b/modules/monitoring/library/Monitoring/Timeline/TimeRange.php
@@ -4,11 +4,11 @@
 
 namespace Icinga\Module\Monitoring\Timeline;
 
-use \StdClass;
-use \Iterator;
-use \DateTime;
-use \DateInterval;
-use Icinga\Util\DateTimeFactory;
+use StdClass;
+use Iterator;
+use DateTime;
+use DateInterval;
+use Icinga\Util\Format;
 
 /**
  * A range of time split into a specific interval
@@ -172,17 +172,17 @@ class TimeRange implements Iterator
         } elseif ($this->interval->m) {
             for ($i = 0; $i < $this->interval->m; $i++) {
                 if ($this->negative) {
-                    $dateTime->sub(new DateInterval('PT' . DateTimeFactory::getSecondsByMonth($dateTime) . 'S'));
+                    $dateTime->sub(new DateInterval('PT' . Format::secondsByMonth($dateTime) . 'S'));
                 } else {
-                    $dateTime->add(new DateInterval('PT' . DateTimeFactory::getSecondsByMonth($dateTime) . 'S'));
+                    $dateTime->add(new DateInterval('PT' . Format::secondsByMonth($dateTime) . 'S'));
                 }
             }
         } elseif ($this->interval->y) {
             for ($i = 0; $i < $this->interval->y; $i++) {
                 if ($this->negative) {
-                    $dateTime->sub(new DateInterval('PT' . DateTimeFactory::getSecondsByYear($dateTime) . 'S'));
+                    $dateTime->sub(new DateInterval('PT' . Format::secondsByYear($dateTime) . 'S'));
                 } else {
-                    $dateTime->add(new DateInterval('PT' . DateTimeFactory::getSecondsByYear($dateTime) . 'S'));
+                    $dateTime->add(new DateInterval('PT' . Format::secondsByYear($dateTime) . 'S'));
                 }
             }
         }