diff --git a/MP4/box_mdhd.cpp b/MP4/box_mdhd.cpp
index e3cf8ab1..a0e75979 100644
--- a/MP4/box_mdhd.cpp
+++ b/MP4/box_mdhd.cpp
@@ -12,6 +12,34 @@ Box * Box_mdhd::GetBox() {
   return Container;
 }
 
+void Box_mdhd::SetCreationTime( uint32_t TimeStamp ) {
+  uint32_t CreationTime;
+  if(!TimeStamp) {
+    CreationTime = time(NULL) + SECONDS_DIFFERENCE;
+  } else {
+    CreationTime = TimeStamp;
+  }
+  Container->SetPayload((uint32_t)4,Box::uint32_to_uint8(CreationTime),4);
+}
+
+void Box_mdhd::SetModificationTime( uint32_t TimeStamp ) {
+  uint32_t ModificationTime;
+  if(!TimeStamp) {
+    ModificationTime = time(NULL) + SECONDS_DIFFERENCE;
+  } else {
+    ModificationTime = TimeStamp;
+  }
+  Container->SetPayload((uint32_t)4,Box::uint32_to_uint8(ModificationTime),8);
+}
+
+void Box_mdhd::SetTimeScale( uint32_t TimeUnits ) {
+  Container->SetPayload((uint32_t)4,Box::uint32_to_uint8(TimeUnits),12);
+}
+
+void Box_mdhd::SetDurationTime( uint32_t TimeUnits ) {
+  Container->SetPayload((uint32_t)4,Box::uint32_to_uint8(TimeUnits),16);
+}
+
 void Box_mdhd::SetLanguage( uint8_t Firstchar, uint8_t Secondchar, uint8_t Thirdchar ) {
   uint8_t FirstByte = 0;
   uint8_t SecondByte = 0;
@@ -22,4 +50,20 @@ void Box_mdhd::SetLanguage( uint8_t Firstchar, uint8_t Secondchar, uint8_t Third
   FirstByte += (Secondchar >> 3);
   SecondByte += (Secondchar << 5);
   SecondByte += Thirdchar;
+
+  Container->SetPayload((uint32_t)1,&SecondByte,21);
+  Container->SetPayload((uint32_t)1,&FirstByte,20);
+}
+
+void Box_mdhd::SetReserved() {
+  Container->SetPayload((uint32_t)2,Box::uint16_to_uint8(0),22);
+  Container->SetPayload((uint32_t)4,Box::uint32_to_uint8(0));
+}
+
+void Box_mdhd::SetDefaults() {
+  SetLanguage();
+  SetDurationTime();
+  SetTimeScale();
+  SetModificationTime();
+  SetCreationTime();
 }
diff --git a/MP4/box_mdhd.h b/MP4/box_mdhd.h
index 9ba99d10..b71b9cf5 100644
--- a/MP4/box_mdhd.h
+++ b/MP4/box_mdhd.h
@@ -1,14 +1,17 @@
 #include "box.h"
+#include <ctime>
+
+#define SECONDS_DIFFERENCE 2082844800
 
 class Box_mdhd {
   public:
     Box_mdhd( );
     ~Box_mdhd();
     Box * GetBox();
-//    void SetCreationTime( uint32_t TimeStamp = 0 );
-//    void SetModificationTime( uint32_t TimeStamp = 0 );
-//    void SetTimeScale( uint32_t TimeUnits = 0 );
-//    void SetDurationTime( uint32_t TimeUnits = 0 );
+    void SetCreationTime( uint32_t TimeStamp = 0 );
+    void SetModificationTime( uint32_t TimeStamp = 0 );
+    void SetTimeScale( uint32_t TimeUnits = 0 );
+    void SetDurationTime( uint32_t TimeUnits = 0 );
     void SetLanguage( uint8_t Firstchar = 'n', uint8_t Secondchar = 'l', uint8_t Thirdchar = 'd' );
   private:
     void SetReserved();