diff --git a/libgrive/src/drive/Resource.cc b/libgrive/src/drive/Resource.cc
index 268c92f..c044abc 100644
--- a/libgrive/src/drive/Resource.cc
+++ b/libgrive/src/drive/Resource.cc
@@ -370,7 +370,10 @@ void Resource::Sync( http::Agent *http, DateTime& sync_time )
 	assert( m_state != unknown ) ;
 	assert( !IsRoot() || m_state == sync ) ;	// root folder is already synced
 	
-	SyncSelf( http, sync_time ) ;
+  SyncSelf( http ) ;
+  // we want the server sync time, so we will take the server time of the last file uploaded to store as the sync time
+  // m_mtime is updated to server modified time when the file is uploaded
+  sync_time = std::max(sync_time, m_mtime);
 	
 	// if myself is deleted, no need to do the childrens
 	if ( m_state != local_deleted && m_state != remote_deleted )
@@ -378,7 +381,7 @@ void Resource::Sync( http::Agent *http, DateTime& sync_time )
 			boost::bind( &Resource::Sync, _1, http, boost::ref(sync_time) ) ) ;
 }
 
-void Resource::SyncSelf( http::Agent* http, DateTime& sync_time )
+void Resource::SyncSelf( http::Agent* http )
 {
 	assert( !IsRoot() || m_state == sync ) ;	// root is always sync
 	assert( IsRoot() || http == 0 || fs::is_directory( m_parent->Path() ) ) ;
@@ -392,7 +395,7 @@ void Resource::SyncSelf( http::Agent* http, DateTime& sync_time )
 	case local_new :
 		Log( "sync %1% doesn't exist in server, uploading", path, log::info ) ;
 		
-		if ( http != 0 && Create( http, sync_time ) )
+		if ( http != 0 && Create( http ) )
 			m_state = sync ;
 		break ;
 	
@@ -404,7 +407,7 @@ void Resource::SyncSelf( http::Agent* http, DateTime& sync_time )
 	
 	case local_changed :
 		Log( "sync %1% changed in local. uploading", path, log::info ) ;
-		if ( http != 0 && EditContent( http, sync_time ) )
+		if ( http != 0 && EditContent( http ) )
 			m_state = sync ;
 		break ;
 	
@@ -517,7 +520,7 @@ void Resource::Download( http::Agent* http, const fs::path& file ) const
 	}
 }
 
-bool Resource::EditContent( http::Agent* http, DateTime& sync_time )
+bool Resource::EditContent( http::Agent* http )
 {
 	assert( http != 0 ) ;
 	assert( m_parent != 0 ) ;
@@ -530,10 +533,10 @@ bool Resource::EditContent( http::Agent* http, DateTime& sync_time )
 		return false ;
 	}
 	
-	return Upload( http, m_edit, false, sync_time ) ;
+	return Upload( http, m_edit, false ) ;
 }
 
-bool Resource::Create( http::Agent* http, DateTime& sync_time )
+bool Resource::Create( http::Agent* http)
 {
 	assert( http != 0 ) ;
 	assert( m_parent != 0 ) ;
@@ -563,7 +566,7 @@ bool Resource::Create( http::Agent* http, DateTime& sync_time )
 	}
 	else if ( !m_parent->m_create.empty() )
 	{
-		return Upload( http, m_parent->m_create + "?convert=false", true, sync_time ) ;
+		return Upload( http, m_parent->m_create + "?convert=false", true ) ;
 	}
 	else
 	{
@@ -575,8 +578,7 @@ bool Resource::Create( http::Agent* http, DateTime& sync_time )
 bool Resource::Upload(
 	http::Agent* 		http,
 	const std::string&	link,
-	bool 				post,
-	DateTime& 			sync_time )
+	bool 				post)
 {
 	assert( http != 0 ) ;
 	
@@ -612,7 +614,7 @@ bool Resource::Upload(
 	
 	http->Put( uplink, file, &xml, uphdr ) ;
 	AssignIDs( Entry( xml.Response() ) ) ;
-	sync_time = std::max(Entry(xml.Response()).MTime(), sync_time);
+  m_mtime = Entry(xml.Response()).MTime();
 	
 	return true ;
 }
diff --git a/libgrive/src/drive/Resource.hh b/libgrive/src/drive/Resource.hh
index 75efdc4..b0cb2b8 100644
--- a/libgrive/src/drive/Resource.hh
+++ b/libgrive/src/drive/Resource.hh
@@ -124,9 +124,9 @@ private :
 	void SetState( State new_state ) ;
 
 	void Download( http::Agent* http, const fs::path& file ) const ;
-	bool EditContent( http::Agent* http, DateTime& sync_time ) ;
-	bool Create( http::Agent* http, DateTime& sync_time ) ;
-	bool Upload( http::Agent* http, const std::string& link, bool post, DateTime& sync_time ) ;
+	bool EditContent( http::Agent* http ) ;
+	bool Create( http::Agent* http ) ;
+	bool Upload( http::Agent* http, const std::string& link, bool post ) ;
 	
 	void FromRemoteFolder( const Entry& remote, const DateTime& last_sync ) ;
 	void FromRemoteFile( const Entry& remote, const DateTime& last_sync ) ;
@@ -135,7 +135,7 @@ private :
 	void DeleteRemote( http::Agent* http ) ;
 	
 	void AssignIDs( const Entry& remote ) ;
-	void SyncSelf( http::Agent* http, DateTime& sync_time ) ;
+	void SyncSelf( http::Agent* http ) ;
 	
 private :
 	std::string				m_name ;