How to use the latitude and longitude to get local time, not the server time?

Question

hey guyts,

because I can't find how to use the latitude and longitude to get local time,

The original method is to use the timezone through google to get the offset for daylight-savings time.

I want to solve this problem.

evtguy · Answer

I tried to update my sample to actually return the local time at the location clicked but I'm having trouble doing so. It's returning the time but off one hour so I don't know if that's due to daylight savings or GMT being 0, etc. Perhaps a more savvy coder can find the error of my ways. Here's an updated processResults function that returns the timezone offset and the local time (but off by one hour): function processResults(results) { var features = results.featureSet.features; if (features.length > 0) { var timeOffset = features[0].attributes.ZONE; var curDate = new Date(); curDate.setUTCMinutes(curDate.getUTCMinutes() + (timeOffset*60)); var hours = curDate.getUTCHours(); var minutes = curDate.getUTCMinutes(); var ampm = hours >= 12 ? 'pm' : 'am'; hours = hours % 12; hours = hours ? hours : 12; // the hour '0' should be '12' minutes = minutes < 10 ? '0'+minutes : minutes; var strTime = hours + ':' + minutes + ' ' + ampm; alert('The zone offset for the clicked location is ' + features[0].attributes.ZONE + ' and the local time is ' + strTime); //curDate.toUTCString()); }; };‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

evtguy · Answer

You would use Query & QueryTask similar to what's shown in this example. The example uses the location where you click on the map but in your case, you would create a point using your lat/long values and then pass that as the value used with query.Geometry. <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <meta name="viewport" content="initial-scale=1, maximum-scale=1,user-scalable=no"/> <title>Simple Maptitle> <link rel="stylesheet" href="https://js.arcgis.com/3.25/esri/css/esri.css"> <style> html, body, #map { height: 100%; margin: 0; padding: 0; } style> <script src="https://js.arcgis.com/3.25/">script> <script> var map; require(["dojo/on","esri/map","esri/layers/FeatureLayer","esri/tasks/query", "esri/tasks/QueryTask","dojo/domReady!"], function(on,Map,FeatureLayer,Query,QueryTask) { map = new Map("map", { basemap: "topo", //For full list of pre-defined basemaps, navigate to http://arcg.is/1JVo6Wd center: [-100.45, 37.75], // longitude, latitude zoom: 4 }); var featureLayer = new FeatureLayer("https://services.arcgis.com/P3ePLMYs2RVChkJx/ArcGIS/rest/services/World_Time_Zones/FeatureServer/0",{opacity:0.5}); map.addLayer(featureLayer); map.on("click", function(evt){ var queryTask = new QueryTask("https://services.arcgis.com/P3ePLMYs2RVChkJx/ArcGIS/rest/services/World_Time_Zones/FeatureServer/0"); var query = new Query(); query.geometry = evt.mapPoint; query.outFields = ["*"]; queryTask.on("complete", processResults); queryTask.execute(query); function processResults(results) { var features = results.featureSet.features; if (features.length > 0) { alert('The zone offset for the clicked location is ' + features[0].attributes.ZONE); }; }; }); }); script> head> <body> <div><h2>Click on the map to get the time zone offseth2>div> <div id="map">div> body> html>‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

HsuKao-Ming · Answer

Steve,

How can I use that for javascript or json?