Include isdsts field in data

tasks/data-collect.js

@@ -20,6 +20,7 @@ module.exports = function (grunt) {
 				abbrs   = [],
 				untils  = [],
 				offsets = [],
+				isdsts = [],
 				countries = [];
 
 			lines.forEach(function (line) {
@@ -33,6 +34,11 @@ module.exports = function (grunt) {
 				offsets.push(+utc.diff(local, 'minutes', true).toFixed(4));
 				untils.push(+utc);
 				abbrs.push(parts[13]);
+
+				const index = parts.findIndex(element => element.includes("isdst"));
+				if (index !== -1) {
+					isdsts.push(parseInt(parts[index].split("=")[1]));
+				}
 			});
 
 			if (offsets.length === 0 && lines.length === 3 && lines[2].length === 0) {
@@ -58,12 +64,13 @@ module.exports = function (grunt) {
 				untils     : untils,
 				offsets    : offsets,
 				population : populations[name] | 0,
-				countries  : countries
+				countries  : countries,
+				isdsts: isdsts
 			});
 		});
 
 		grunt.file.write('temp/collect/' + version + '.json', JSON.stringify(data, null, 2));
 
 		grunt.log.ok('Collected data for ' + version);
 	});
-};
+};

tasks/data-dedupe.js

@@ -22,7 +22,8 @@ function dedupe(zone) {
 		untils     : untils,
 		offsets    : offsets,
 		population : zone.population,
-		countries  : zone.countries
+		countries  : zone.countries,
+		isdsts  : zone.isdsts
 	};
 }