diff --git a/src/sammo/TimeUtil.php b/src/sammo/TimeUtil.php
index 84572bcb..addaf22b 100644
--- a/src/sammo/TimeUtil.php
+++ b/src/sammo/TimeUtil.php
@@ -5,62 +5,111 @@ class TimeUtil
 {
     public static function DateToday()
     {
-        return date('Y-m-d');
+        $obj = new \DateTime();
+        return $obj->format('Y-m-d');
     }
 
-    public static function DatetimeNow()
+    public static function DatetimeNow(bool $withFraction=false)
     {
-        return date('Y-m-d H:i:s');
+        $obj = new \DateTime();
+        if(!$withFraction){
+            return $obj->format('Y-m-d H:i:s');
+        }
+        return $obj->format('Y-m-d H:i:s.u');
     }
 
-    public static function DatetimeFromNowDay($day)
+    public static function DatetimeFromNowDay($day, bool $withFraction=false)
     {
-        return date('Y-m-d H:i:s', strtotime("{$day} days"));
+        $obj = new \DateTime();
+        $obj->modify("{$day} days");
+        if(!$withFraction){
+            return $obj->format('Y-m-d H:i:s');
+        }
+        return $obj->format('Y-m-d H:i:s.u');
     }
 
-    public static function DatetimeFromNowHour($hour)
+    public static function DatetimeFromNowHour($hour, bool $withFraction=false)
     {
-        return date('Y-m-d H:i:s', strtotime("{$hour} hours"));
+        $obj = new \DateTime();
+        $obj->modify("{$hour} hours");
+        if(!$withFraction){
+            return $obj->format('Y-m-d H:i:s');
+        }
+        return $obj->format('Y-m-d H:i:s.u');
     }
 
-    public static function DatetimeFromNowMinute($minute)
+    public static function DatetimeFromNowMinute($minute, bool $withFraction=false)
     {
-        return date('Y-m-d H:i:s', strtotime("{$minute} minutes"));
+        $obj = new \DateTime();
+        $obj->modify("{$minute} minutes");
+        if(!$withFraction){
+            return $obj->format('Y-m-d H:i:s');
+        }
+        return $obj->format('Y-m-d H:i:s.u');
     }
 
-    public static function DatetimeFromNowSecond($second)
+    public static function DatetimeFromNowSecond($second, bool $withFraction=false)
     {
-        return date('Y-m-d H:i:s', strtotime("{$second} seconds"));
+        $obj = new \DateTime();
+        $obj->modify("{$second} seconds");
+        if(!$withFraction){
+            return $obj->format('Y-m-d H:i:s');
+        }
+        return $obj->format('Y-m-d H:i:s.u');
     }
 
-    public static function DatetimeFromMinute($date, $minute)
+    public static function DatetimeFromMinute($date, $minute, bool $withFraction=false)
     {
-        return date('Y-m-d H:i:s', strtotime($date) + $minute*60);
+        $obj = new \DateTime($date);
+        $obj->modify("{$minute} minutes");
+        if(!$withFraction){
+            return $obj->format('Y-m-d H:i:s');
+        }
+        return $obj->format('Y-m-d H:i:s.u');
     }
 
-    public static function DatetimeFromSecond($date, $second)
+    public static function DatetimeFromSecond($date, $second, bool $withFraction=false)
     {
-        return date('Y-m-d H:i:s', strtotime($date) + $second);
+        $obj = new \DateTime($date);
+        $obj->modify("{$second} seconds");
+        if(!$withFraction){
+            return $obj->format('Y-m-d H:i:s');
+        }
+        return $obj->format('Y-m-d H:i:s.u');
     }
 
-    public static function CutSecond($date)
-    {
-        $date[17] = '0';
-        $date[18] = '0';
-        return $date;
+    public static function SecondsToDateInterval(float $fullSeconds): \DateInterval{
+        $seconds = floor($fullSeconds);
+        $fraction = $fullSeconds - $seconds;
+
+        $interval = new \DateInterval("PT0S");
+        $interval->s = $seconds;
+        $interval->f = $fraction;
+
+        $d0 = new \DateTimeImmutable("@0");
+        $d1 = $d0->add($interval);
+
+        return $d1->diff($d0);
     }
 
-    public static function CutMinute($date)
-    {
-        $date[14] = '0';
-        $date[15] = '0';
-        $date[17] = '0';
-        $date[18] = '0';
-        return $date;
-    }
-
-    public static function HourMinuteSecond($second)
-    {
-        return date('H:i:s', strtotime('00:00:00') + $second);
+    public static function DateIntervalToSeconds(\DateInterval $interval): float{
+        if($interval->days !== FALSE){
+            $days = $interval->days;
+        }
+        else{
+            if($interval->y != 0){
+                throw new \InvalidArgumentException('Year argument conversion is not supported');
+            }
+            if($interval->m != 0){
+                throw new \InvalidArgumentException('Month argument conversion is not supported');
+            }
+            $days = $interval->d;
+        }
+        
+        $hours = $days * 24 + $interval->h;
+        $minutes = $hours * 60 + $interval->i;
+        $seconds = $minutes * 60 + $interval->s + $interval->f;
+        
+        return $seconds;
     }
 }