diff --git a/grive/src/main.cc b/grive/src/main.cc
index e38b0f6..aa713c2 100644
--- a/grive/src/main.cc
+++ b/grive/src/main.cc
@@ -130,13 +130,14 @@ int Main( int argc, char **argv )
 		
 		// log grive version to log file
 		file_log->Log( log::Fmt("grive version " VERSION " " __DATE__ " " __TIME__), log::verbose ) ;
+		file_log->Log( log::Fmt("current time: %1%") % DateTime::Now(), log::verbose ) ;
 		
 		comp_log->Add( file_log ) ;
 	}
 	if ( vm.count( "version" ) )
 	{
 		std::cout
-			<< "grive version " VERSION " " __DATE__ " " __TIME__ << std::endl ;
+			<< "grive version " << VERSION << ' ' << __DATE__ << ' ' << __TIME__ << std::endl ;
 		return 0 ;
 	}
 	if ( vm.count( "verbose" ) )
diff --git a/libgrive/src/drive/Drive.cc b/libgrive/src/drive/Drive.cc
index 5fd43f8..1b13d93 100644
--- a/libgrive/src/drive/Drive.cc
+++ b/libgrive/src/drive/Drive.cc
@@ -66,13 +66,12 @@ Drive::Drive( OAuth2& auth, const Json& options ) :
 	http::CurlAgent http ;
 
 	long prev_stamp = m_state.ChangeStamp() ;
-	Trace( "previous time stamp is %1%", prev_stamp ) ;
+	Trace( "previous change stamp is %1%", prev_stamp ) ;
 	
 	// get metadata
 	http::XmlResponse xrsp ;
 // 	http::ResponseLog log( "meta-", ".xml", &xrsp ) ;
 	http.Get( "https://docs.google.com/feeds/metadata/default", &xrsp, m_http_hdr ) ;
-	Trace( "return %1%", xrsp.Response()["docs:largestChangestamp"] ) ;
 	m_state.ChangeStamp( 
 		std::atoi(xrsp.Response()["docs:largestChangestamp"]["@value"].front().Value().c_str()) ) ;
 	
diff --git a/libgrive/src/drive/Resource.cc b/libgrive/src/drive/Resource.cc
index 1df51cf..a4e8501 100644
--- a/libgrive/src/drive/Resource.cc
+++ b/libgrive/src/drive/Resource.cc
@@ -502,8 +502,10 @@ void Resource::Download( http::Agent* http, const fs::path& file, const http::He
 	long r = http->Get( m_content, &dl, auth ) ;
 	if ( r <= 400 )
 	{
-		assert( m_mtime != DateTime() ) ;
-		os::SetFileTime( file, m_mtime ) ;
+		if ( m_mtime != DateTime() )
+			os::SetFileTime( file, m_mtime ) ;
+		else
+			Log( "encountered zero date time after downloading %1%", file, log::warning ) ;
 	}
 }