gmaps_lat_lng_to_dms.js

function toDMS(deg) {
    var d = Math.floor(deg);
    var min = Math.floor((deg - d) * 60);
    var sec = ((deg - d - min / 60) * 3600).toFixed(2);
    return d + "° " + min + "' " + sec + "\"";
}

function convertLatLngToDMS(lat, lng) {
    var latDMS = lat >= 0 ? "N" : "S";
    var lngDMS = lng >= 0 ? "E" : "W";
    
    lat = Math.abs(lat);
    lng = Math.abs(lng);
    
    var latDMSString = toDMS(lat);
    var lngDMSString = toDMS(lng);
    
    return latDMSString + " " + latDMS + " " + lngDMSString + " " + lngDMS;
}

const lat = 64.75960;
const lng = -104.21007;

const dms = convertLatLngToDMS(lat, lng)
console.log(dms); // 64° 45' 34.56" N 104° 12' 36.25" W