This　paper　purposes　on　extending　the　application　of　Geographic　Information　System　(GIS)　on　temporal　simulation　and　prediction　of　direct　sunlight　on　buildings　and　shading　areas　due　to　buildings　at　certain　time　period.　The　3D　building　models　required　for　the　GIS　based　sunlight　analysis　were　created　in　Google　SketchUp　8,　and　consequently　a　sunlight　analysis　tool　was　developed　based　on　the　3D　spatial　analysis　tools　and　ModelBuilder　in　ESRI　ArcGIS　10.　The　result　of　the　case　study　evidences　that　by　providing　the　3D　building　models　and　proper　time　settings,　the　proposed　tool　can　efficiently　and　effectively　simulate　the　direct　sunlight　conditions　of　buildings　at　different　time　period.