diff --git a/index.html b/index.html
index 128c621..6ec46db 100644
--- a/index.html
+++ b/index.html
@@ -34,49 +34,40 @@
         ["#FF6600", "#FCD202", "#309E09", "#0D8ECF", "#2A0CD0",
          "#CD0D74", "#CC0000", "#00CC00", "#0000CC", "#0D9D9D",
          "#999999", "#333333", "#990000", "#a0ee70", "#f0ff00",] ;
-    var guides = [{
-	    	date: "2017/01/15 00:00", toDate: "2017/1/16 00:00",
-	    	 fillColor: "#f08080", fillAlpha: 0.1, lineAlpha: 0
-	    },{
-	    	date: "2017/01/14 00:00", toDate: "2017/1/15 00:00",
-	    	 fillColor: "#8080f0", fillAlpha: 0.1, lineAlpha: 0
-	    },{
-	    	date: "2017/01/08 00:00", toDate: "2017/1/9 00:00",
-	    	 fillColor: "#f08080", fillAlpha: 0.1, lineAlpha: 0
-	    },{
-	    	date: "2017/01/07 00:00", toDate: "2017/1/8 00:00",
-	    	 fillColor: "#8080f0", fillAlpha: 0.1, lineAlpha: 0
-	    },{
-	    	date: "2017/1/1", toDate: "2017/1/2",
-	    	 fillColor: "#f08080", fillAlpha: 0.1, lineAlpha: 0
-	    },{
-	    	date: "2016/12/31 0:0", toDate: "2017/1/1 0:0",
-	    	 fillColor: "#8080f0", fillAlpha: 0.1, lineAlpha: 0
-	    },{
-	    	date: "2016/12/24 0:0", toDate: "2016/12/25 0:0",
-	    	 fillColor: "#8080f0", fillAlpha: 0.1, lineAlpha: 0
-	    },{
-	    	date: "2016/12/25 0:0", toDate: "2016/12/26 0:0",
-	    	 fillColor: "#f08080", fillAlpha: 0.1, lineAlpha: 0
-	    },{
-	    	date: "2016/12/17 0:0", toDate: "2016/12/18 0:0",
-	    	 fillColor: "#8080f0", fillAlpha: 0.1, lineAlpha: 0
-	    },{
-	    	date: "2016/12/18 0:0", toDate: "2016/12/19 0:0",
-	    	 fillColor: "#f08080", fillAlpha: 0.1, lineAlpha: 0
-	    },{
-	    	date: "2016/12/10 0:0", toDate: "2016/12/11 0:0",
-	    	 fillColor: "#8080f0", fillAlpha: 0.1, lineAlpha: 0
-	    },{
-	    	date: "2016/12/11 0:0", toDate: "2016/12/12 0:0",
-	    	 fillColor: "#f08080", fillAlpha: 0.1, lineAlpha: 0
-	    },{
-	    	date: "2016/12/03 0:0", toDate: "2016/12/04 0:0",
-	    	 fillColor: "#8080f0", fillAlpha: 0.1, lineAlpha: 0
-	    },{
-	    	date: "2016/12/04 0:0", toDate: "2016/12/05 0:0",
-	    	 fillColor: "#f08080", fillAlpha: 0.1, lineAlpha: 0
-	    }];
+
+    function paint_day(day, color) {
+        var today = new Date(day);
+        var tomorrow = new Date(day);
+        tomorrow.setDate(tomorrow.getDate() + 1);
+        return {
+             date: today, toDate: tomorrow,
+             fillColor: color, fillAlpha: 0.1, lineAlpha: 0
+        };
+    }
+
+    function make_guides(data) {
+        var today = new Date(data[0].datetime);
+        var to = new Date(data[data.length-1].datetime);
+        var guides = [];
+
+        for (;today <= to;) { // FF to Sat or Sun
+            var d = today.getDay();
+            if (d == 0) {
+                guides.push(paint_day(today, "#f08080"));
+                today.setDate(today.getDate()+1);
+            } else if (d == 6) {
+                guides.push(paint_day(today, "#8080f0"));
+                today.setDate(today.getDate()+1);
+                guides.push(paint_day(today, "#f08080"));
+                today.setDate(today.getDate()+6);
+            } else {
+                today.setDate(today.getDate()+1);
+            }
+        }
+        return guides;
+    }
+
+    var guides = make_guides(data);
 
         sensors = [
             [ 1, "工作室"],   [ 2, "実験室LB"],