diff --git a/public/javascripts/chart_utilities.js b/public/javascripts/chart_utilities.js
index 6996455..4b5d4c2 100644
--- a/public/javascripts/chart_utilities.js
+++ b/public/javascripts/chart_utilities.js
@@ -4,7 +4,6 @@ import {DateTime} from './luxon.min.js'
 export const colors = {'eq': '#0000FF', 'max': '#FF0000', 'min': '#008000', 'peaks': '#DAA520'};
 
 // Defaults für die Mittelwertbildungen
-const refreshRate = 5;                  // Grafik so oft auffrischen (in Minuten)
 let txtMeldung = false;					// falls keine Daten da sind, Text melden
 const avgTime = 30;						// defaul average time für particulate matter
 let doUpdate = true;					// update every 5 min
diff --git a/public/javascripts/datetime.js b/public/javascripts/datetime.js
index 9dae8dc..aa99aa8 100644
--- a/public/javascripts/datetime.js
+++ b/public/javascripts/datetime.js
@@ -1,13 +1,25 @@
 // all date and time functions
 import { DateTime } from './luxon.min.js'
+import {loadAll, showChart, setNoUTC} from './showcharts.js'
+import {getCurrentTab} from "./chart_utilities.js";
+
 
 // Show date and time (every minute)
-export const showDate = (sofort) => {
+// Will be called every second
+export const showDate = (sofort, params) => {
     let d = DateTime.now()
     if(sofort || d.second === 0) {
         document.querySelector('#h1datum').innerHTML = d.toFormat('yyyy-MM-dd HH:mm')
     }
-
+    if (((d.minute % params.refreshRate) == 0) && (d.second == 15)) {  // alle ganzen refreshRate Minuten, 15sec danach
+        let start = 1
+        console.log(params.refreshRate, 'Minuten um, Grafik wird erneuert');
+        let ct = getCurrentTab()
+        if (ct === 'maptab') {
+            start = 0
+        }
+        loadAll(params, start)
+    }
 }
 
 /* ToDo:
diff --git a/public/javascripts/global.js b/public/javascripts/global.js
index 9c522eb..099d628 100644
--- a/public/javascripts/global.js
+++ b/public/javascripts/global.js
@@ -22,8 +22,8 @@ import {setCurrentTab, getCurrentTab, showError, fetchfromserver} from "./chart_
         weeks: 4,
         datetime: '',
         seldate: '',
-        refresh: 0,
-        sid: ''
+        refreshRate: 1,
+        sid: -1
     }
 
     // END global variables
@@ -154,9 +154,9 @@ import {setCurrentTab, getCurrentTab, showError, fetchfromserver} from "./chart_
             })
         })
 
-        dt.showDate(true)
+        dt.showDate(true, params)
         // and show date/time every minute
-        setInterval(() => dt.showDate(false), 1000)
+        setInterval(() => dt.showDate(false, params), 1000)
 
         const csid = parseInt(sysparams.csid)
         if(csid !== -1) {
diff --git a/routes/api.js b/routes/api.js
index d36c5e3..039eaec 100644
--- a/routes/api.js
+++ b/routes/api.js
@@ -15,7 +15,7 @@ const disttable = [
   {type: 'map', func: prep.mapData },
 ]
 
-let APIHOST = process.env.APIHOST || 'http://localhost:3004'
+let APIHOST = process.env.APIHOST || 'http://localhost:3005'
 
 
 /* GET home page. */