warsaw timezone

server/app.py

@@ -48,7 +48,7 @@ def create_app():
         readouts = query.order_by(SensorReadout.timestamp.desc()).limit(300).all()
         return jsonify(
             [
-                {"value": r.value, "timestamp": r.timestamp.isoformat()}
+                {"value": r.value, "timestamp": r.timestamp.isoformat() + "Z"}
                 for r in readouts
             ]
         )
@@ -124,7 +124,7 @@ def create_app():
                 "sensor_id": readout.sensor_id,
                 "type": readout.type,
                 "value": readout.value,
-                "timestamp": readout.timestamp.isoformat(),
+                "timestamp": readout.timestamp.isoformat() + "Z",
             }
         ), 201
 

server/templates/sensors.html

@@ -61,11 +61,12 @@
 
         function formatTimestamp(iso) {
             const d = new Date(iso);
-            const pad = (n) => String(n).padStart(2, '0');
-            const months = ['Jan','Feb','Mar','Apr','May','Jun',
-                            'Jul','Aug','Sep','Oct','Nov','Dec'];
-            return `${d.getDate()} ${months[d.getMonth()]} ${d.getFullYear()}, ` +
-                   `${pad(d.getHours())}:${pad(d.getMinutes())}:${pad(d.getSeconds())}`;
+            return d.toLocaleString('pl-PL', { timeZone: 'Europe/Warsaw' });
+        }
+
+        function formatChartLabel(iso) {
+            const d = new Date(iso + 'Z');
+            return d.toLocaleString('pl-PL', { timeZone: 'Europe/Warsaw', hour: '2-digit', minute: '2-digit', day: '2-digit', month: '2-digit', year: 'numeric' });
         }
 
         async function fetchJSON(url) {
@@ -114,7 +115,7 @@
 
             // fetch hourly data for chart
             const hourly = await fetchJSON(`/api/sensors/${sensorId}/readouts/hourly?type=${type}`);
-            const labels = hourly.map(r => r.timestamp.replace('T', ' '));
+            const labels = hourly.map(r => formatChartLabel(r.timestamp));
             const values = hourly.map(r => r.value);
 
             if (chart) chart.destroy();