fixes problems with daylight-saving-time in weather provider openmeteo (#3931)

fix for #3930

Author: khassel

CHANGELOG.md

@@ -29,6 +29,7 @@ planned for 2026-01-01
 - fixed eslint warnings shown in #3911 and updated npm publish docs (#3913)
 - [core] refactor: replace `express-ipfilter` with lightweight custom middleware (#3917) - This fixes security issue [CVE-2023-42282](https://github.com/advisories/GHSA-78xj-cgh5-2h22), which is not very likely to be exploitable in MagicMirror² setups, but still should be fixed.
 - fixed the Environment Canada weather URL (#3912) and now converts a windspeed of 'calm' to 0
+- fixed problems with daylight-saving-time in weather provider `openmeto` (#3930, #3931)
 
 ### Updated
 

modules/default/weather/providers/openmeteo.js

@@ -280,13 +280,24 @@ WeatherProvider.register("openmeteo", {
 		return `${this.config.apiBase}/forecast?${this.getQueryParameters()}`;
 	},
 
+	// fix daylight-saving-time differences
+	checkDST (dt) {
+		const uxdt = moment.unix(dt);
+		const nowDST = moment().isDST();
+		if (nowDST === moment(uxdt).isDST()) {
+			return uxdt;
+		} else {
+			return uxdt.add(nowDST ? +1 : -1, "hour");
+		}
+	},
+
 	// Transpose hourly and daily data matrices
 	transposeDataMatrix (data) {
 		return data.time.map((_, index) => Object.keys(data).reduce((row, key) => {
 			return {
 				...row,
 				// Parse time values as momentjs instances
-				[key]: ["time", "sunrise", "sunset"].includes(key) ? moment.unix(data[key][index]) : data[key][index]
+				[key]: ["time", "sunrise", "sunset"].includes(key) ? this.checkDST(data[key][index]) : data[key][index]
 			};
 		}, {}));
 	},