Removed moment for internal implementation

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");
 }
 
 /**