Removed moment for internal implementation

package-lock.json

@@ -179,11 +179,6 @@
         "brace-expansion": "^1.1.7"
       }
     },
-    "moment": {
-      "version": "2.29.1",
-      "resolved": "https://registry.npmjs.org/moment/-/moment-2.29.1.tgz",
-      "integrity": "sha512-kHmoybcPV8Sqy59DwNDY3Jefr64lK/by/da0ViFcuA4DH0vQg5Q6Ze5VimxkfQNSC+Mls/Kx53s7TjP1RhFEDQ=="
-    },
     "ms": {
       "version": "2.1.2",
       "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",

package.json

@@ -26,7 +26,6 @@
 	"dependencies": {
 		"debug": "^4.3.1",
 		"joi": "^17.3.0",
-		"moment": "^2.29.1",
 		"node-forge": "^0.10.0",
 		"tslib": "^2.1.0",
 		"yazl": "^2.5.1"

spec/index.ts

@@ -76,12 +76,11 @@ describe("Passkit-generator", function () {
 			expect(pass.props["expirationDate"]).toBe(undefined);
 		});
 
-		it("Will set expiration with a Date as argument", () => {
-			pass.expiration(new Date(2020, 5, 1, 0, 0, 0));
-			// this is made to avoid problems with winter and summer time:
-			// we focus only on the date and time for the tests.
-			let noTimeZoneDateTime = pass.props["expirationDate"].split("+")[0];
-			expect(noTimeZoneDateTime).toBe("2020-06-01T00:00:00");
+		it("expects a Date object as the only argument", () => {
+			pass.expiration(new Date(2020, 6, 1, 0, 0, 0, 0));
+			// Month starts from 0 in Date Object when used this way, therefore
+			// we expect one month more
+			expect(pass.props["expirationDate"]).toBe("2020-07-01T00:00:00Z");
 		});
 
 		it("An invalid date, will not apply changes", () => {
@@ -96,12 +95,9 @@ describe("Passkit-generator", function () {
 	});
 
 	describe("relevantDate()", () => {
-		it("A date object will apply changes", () => {
+		it("expects a Date object as the only argument", () => {
 			pass.relevantDate(new Date("10-04-2021"));
-			// this is made to avoid problems with winter and summer time:
-			// we focus only on the date and time for the tests.
-			let noTimeZoneDateTime = pass.props["relevantDate"].split("+")[0];
-			expect(noTimeZoneDateTime).toBe("2021-10-04T00:00:00");
+			expect(pass.props["relevantDate"]).toBe("2021-10-04T00:00:00Z");
 		});
 	});
 
@@ -264,8 +260,8 @@ describe("Passkit-generator", function () {
 		});
 
 		it("Will ignore non-Barcodes schema compliant objects", () => {
-			// @ts-expect-error
 			pass.barcodes(
+				// @ts-expect-error
 				5,
 				10,
 				15,

src/utils.ts

@@ -1,4 +1,3 @@
-import moment from "moment";
 import { EOL } from "os";
 import { PartitionedBundle, BundleUnit } from "./schema";
 import { sep } from "path";
@@ -41,13 +40,39 @@ export function dateToW3CString(date: Date) {
 		return "";
 	}
 
-	const parsedDate = moment(date).format();
-
-	if (parsedDate === "Invalid date") {
+	// if it is NaN, it is "Invalid Date"
+	if (isNaN(Number(date))) {
 		return undefined;
 	}
 
-	return parsedDate;
+	const paddedMonth = padMeTwo(date.getMonth() + 1);
+	const paddedDay = padMeTwo(date.getDate());
+	const paddedHour = padMeTwo(date.getHours());
+	const paddedMinutes = padMeTwo(date.getMinutes());
+	const paddedSeconds = padMeTwo(date.getSeconds());
+
+	/**
+	 * Date.prototype.getTimezoneOffset returns the timezone UTC offset in
+	 * minutes of the local machine.
+	 *
+	 * That value should then be used to calculate the effective timezone as
+	 * string, but still that would be related to the machine and not to the
+	 * specified date.
+	 *
+	 * For this reason we are completing date with "Z" TimeZoneDesignator (TZD)
+	 * to say it to use local timezone.
+	 *
+	 * In the future we might think to integrate another parameter to represent
+	 * a custom timezone.
+	 *
+	 * @see https://www.w3.org/TR/NOTE-datetime
+	 */
+
+	return `${date.getFullYear()}-${paddedMonth}-${paddedDay}T${paddedHour}:${paddedMinutes}:${paddedSeconds}Z`;
+}
+
+function padMeTwo(original: string | number) {
+	return String(original).padStart(2, "0");
 }
 
 /**