@erwin-lindemann In der Zeile 1698?
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html += ' formatter: function(params) { /*console.log(params[0].data);*/ let d=String(params[0].data);let sp = d.split(","); return sp[1] +" '+historyItemValuesObj[isTempDP].unit+' am \\\n"+new Date(sp[0]).toLocaleDateString("de-DE", { year: "numeric", month: "short", day: "numeric", hour:"numeric", minute: "numeric", second:"numeric" })},' //substring(0,10)+" "+sp[0].substring(11,16)