diff --git a/dashboard.html b/dashboard.html
index 74e72f2..e984fd5 100755
--- a/dashboard.html
+++ b/dashboard.html
@@ -129,12 +129,12 @@
                         Year</button>
                     </div>
                   </form-->
-                  <a class="dropdown-item" href="#" onclick="dashboard.setTimeRange(86400)">Today</a>
-                  <a class="dropdown-item" href="#" onclick="dashboard.setTimeRange(604800)">This
+                  <a class="dropdown-item" href="#" onclick="dashboard.setTimeRange(-86400)">Today</a>
+                  <a class="dropdown-item" href="#" onclick="dashboard.setTimeRange(-604800)">This
                     Week</a>
-                  <a class="dropdown-item" href="#" onclick="dashboard.setTimeRange(2678400)">This
+                  <a class="dropdown-item" href="#" onclick="dashboard.setTimeRange(-2678400)">This
                     Month</a>
-                  <a class="dropdown-item" href="#" onclick="dashboard.setTimeRange(31536000)">This
+                  <a class="dropdown-item" href="#" onclick="dashboard.setTimeRange(-31536000)">This
                     Year</a>
                 </div>
               </div>
diff --git a/js/blueweather.js b/js/blueweather.js
index 099fffc..19f7fb7 100755
--- a/js/blueweather.js
+++ b/js/blueweather.js
@@ -123,7 +123,7 @@ class BlueWeather {
             };    
         }
 
-        var url = this.host + "/api/json.php?locId="+locId+"&range[from]="+range.from + "&range[to]="+range.to + "&maxVals=" + maxVals
+        var url = this.host + "/api/json.php?locId="+locId+"&range[from]="+range.from + "&range[to]="+range.to + "&maxVals[mode]=" + maxVals.mode + "&maxVals[count]=" + maxVals.count
         this.log("starting location request; URL is: " + url, 3)
         this.xhttp.open("GET", url, async)
         this.xhttp.send()
diff --git a/js/dashboard.js b/js/dashboard.js
index dbc3b9a..cd32a12 100755
--- a/js/dashboard.js
+++ b/js/dashboard.js
@@ -13,7 +13,10 @@ class BlueWeatherDashboard {
     this.params = {
       loc: 1,
       page: -1,
-      maxVals: 100,
+      maxVals: {
+        mode: 'avg',
+        count: 100
+      },
       range: {
         from: "",
         to: ""
@@ -29,7 +32,7 @@ class BlueWeatherDashboard {
   loadDashboard() {
     window.history.pushState("object or string", "Title", this.buildUrl({ "params": JSON.stringify(this.params) }));
 
-    this.setTimeRange(this.params.from, this.params.to, false, false)
+    this.setTimeRange(this.params.range.from, this.params.range.to, false)
 
     // page: -1 for dashboard or sensor id
     var mainContent = document.getElementById('mainContent')
@@ -226,31 +229,23 @@ class BlueWeatherDashboard {
 
     Object.assign(this.params, newParams)
 
+    console.log("params changed: " + JSON.stringify(this.params))
+
     window.history.pushState("object or string", "Title", this.buildUrl({ "params": JSON.stringify(this.params) }));
     this.loadDashboard()
   }
 
-  setTimeRange(from = "", to = "", offset = true, autoReload = true) {
+  setTimeRange(from = "", to = "", autoReload = true) {
     // offset: if true the gien times will be substracted from the current time to get the target time
     this.blueweather.log("changing time range; form: " + from + "; to: " + to + "; (now is: " + new Date().getTime() + ")", 3)
 
-    if (offset) {
-      if (from !== "") {
-        from = new Date().getTime() / 1000 - from
-      }
-
-      if (to !== "") {
-        to = new Date().getTime() / 1000 - parseInt(to)
-      }
-    }
-    else {
       if (from !== "") {
         from = parseInt(from)
       }
       if (to !== "") {
         to = parseInt(to)
       }
-    }
+    
 
     var tmpFrom = from
     var tmpTo = to
@@ -259,10 +254,16 @@ class BlueWeatherDashboard {
       tmpFrom = Math.round(new Date().getTime() / 1000 - 60 * 60 * 24)
     }
 
+    if(tmpFrom < 0) {
+      tmpFrom = Math.round(new Date().getTime() / 1000 + tmpFrom)
+    }
+
     if (tmpTo === "") {
       tmpTo = Math.round(new Date().getTime() / 1000)
     }
 
+    console.log(tmpFrom)
+
     var dateFromString = this.getDateTimeString(tmpFrom, tmpTo - tmpFrom)
     var dateToString = this.getDateTimeString(tmpTo, tmpTo - tmpFrom)