Add date/time helpers to class Icinga\Util\Format

refs #4301

library/Icinga/Util/Format.php

@@ -46,6 +46,48 @@ class Format
         );
     }
 
+    public static function duration($duration)
+    {
+        if (! $duration) return '-';
+        return self::showHourMin($duration);
+    }
+
+    protected static function showHourMin($sec)
+    {
+        $min = floor($sec / 60);
+        if ($min < 60) {
+            return $min . 'm ' . ($sec % 60) . 's';
+        }
+        $hour = floor($min / 60);
+        if ($hour < 24) {
+            return date('H:i', time() - $sec);
+        }
+        return floor($hour / 24) . 'd ' . ($hour % 24) . 'h';
+    }
+
+    public static function timeSince($timestamp)
+    {
+        if (! $timestamp) return '-';
+        $duration = time() - $timestamp;
+        $prefix = '';
+        if ($duration < 0) {
+            $prefix = '-';
+            $duration *= -1;
+        }
+        if ($duration > 3600 * 24 * 3) {
+            if (date('Y') === date('Y', $timestamp)) {
+                return date('d.m.', $timestamp);
+            }
+            return date('m.Y', $timestamp);
+        }
+        return $prefix . self::showHourMin($duration);
+    }
+
+    public static function timeUntil($timestamp)
+    {
+        return self::duration($timestamp - time());
+    }
+
     protected static function formatForUnits($value, & $units, $base)
     {
         $sign = '';