JS - Guess what a "date" string format was and put that information in a object

parseDate.js

/*
* parameter: a string with a possible date
* returns: false if it can't decode, otherwise an object like the following:
* {type, hour, minute, second, year, month, day}
* 'type' is the numeric index of the format that the string was guessed from.
*/
function parseDate(v) {
		/*
     * Every one of those options belo is a valid entry for the 'v' argument
     * If some information is missing, it usually is replaced by current date info
     * For example, "21/01" will be filled with todays year, hour and minute.
     * Date seconds usually are set to zero due to conventions.
     */
  
   /* var options = [
			"99:99:99 99/99/9999",
			"99:99:99 99/99/99",
			"99:99:99 99/99",
			"99:99:99",
			"99:99 99/99/9999",
			"99:99 99/99/99",
			"99:99 99/99",
			"99:99",
			"99/99",
			"99/99/9999",
			"9999/99/99",
			"9999/99/99 99:99",
			"9999/99/99 99:99:99",
		];*/
		var ret;
		var today = new Date();
		var strings = (v.match(/\d+/g));
		var n = strings.map(n=>parseInt(n, 10));
		var divisions = (v.match(/\D+/g));
		if (divisions) {
			divisions = divisions.join('');
		} else {
			if (strings[0].length === 4 && n[0] > 1700 && n[0] < 2200) {
				return { type: 0, hour: today.getHours(), minute: today.getMinutes(), second: 0, day: today.getDate(), month: today.getMonth()+1, year: n[0] }
			} else {
				return false;
			}
		}
		if (divisions === ":: //") {
			if (strings[0].length > 2 || strings[1].length > 2 || strings[2].length > 2 || strings[3].length > 4 || strings[4].length > 2 || strings[5].length > 4) {
				return false;
			} else if (strings[5].length > 2) {
				ret = { type: 1, hour: n[0], minute: n[1], second: n[2], day: n[3], month: n[4], year: n[5] }
			} else {
				ret = { type: 2, hour: n[0], minute: n[1], second: n[2], day: n[3], month: n[4], year: ((n[5] > 60)?1900:2000)+n[5] };
			}
		} else if (divisions === ":: /") {
			if (strings[0].length > 2 || strings[1].length > 2 || strings[2].length > 2 || strings[3].length > 4 || strings[4].length > 2) {
				return false;
			} else {
				ret = { type: 3, hour: n[0], minute: n[1], second: n[2], day: n[3], month: n[4], year: today.getYear()+1900 }
			}
		} else if (divisions === "::" || divisions === ":: ") {
			if (strings[0].length > 2 || strings[1].length > 2 || strings[2].length > 2) {
				return false;
			} else {
				ret = { type: 4, hour: n[0], minute: n[1], second: n[2], day: today.getDate(), month: today.getMonth()+1, year: today.getYear()+1900 };
			}
		} else if (divisions === ": //") {
			if (strings[0].length > 2 || strings[1].length > 2 || strings[2].length > 2 || strings[3].length > 2 || strings[4].length > 4) {
				return false;
			} else if (strings[4].length > 2) {
				ret = { type: 5, hour: n[0], minute: n[1], second: 0, day: n[2], month: n[3], year: n[4] }
			} else {
				ret = { type: 6, hour: n[0], minute: n[1], second: 0, day: n[2], month: n[3], year: ((n[4] > 60)?1900:2000)+n[4] };
			}
		} else if (divisions === ": /") {
			if (strings[0].length > 2 || strings[1].length > 2 || strings[2].length > 2 || strings[3].length > 2) {
				return false;
			} else {
				ret = { type: 7, hour: n[0], minute: n[1], second: 0, day: n[2], month: n[3], year: today.getYear()+1900 };
			}
		} else if (divisions === ":") {
			if (strings[0].length > 2 || strings[1].length > 2) {
				return false;
			} else {
				ret = { type: 8, hour: n[0], minute: n[1], second: 0, day: today.getDate(), month: today.getMonth()+1, year: today.getYear()+1900 };
			}
		} else if (divisions === "/") {
			if (strings[0].length > 2 || strings[1].length > 2) {
				return false;
			} else {
				ret = { type: 9, hour: today.getHours(), minute: today.getMinutes(), second: 0, day: n[0], month: n[1], year: today.getYear()+1900 };
			}
		} else if (divisions === "//") {
			if (strings[0].length > 4 || strings[0].length === 3 || strings[1].length > 2 || strings[1].length > 2) {
				return false;
			} else if (strings[0].length === 4) {
				ret = { type: 10, hour: today.getHours(), minute: today.getMinutes(), second: 0, day: n[2], month: n[1], year: n[0] };
			} else if (strings[0].length <= 2 && n[0] < 32 && n[1] < 13) {
				if (strings[2].length === 4) {
					ret = { type: 11, hour: today.getHours(), minute: today.getMinutes(), second: 0, day: n[0], month: n[1], year: n[2] };
				} else {
					ret = { type: 12, hour: today.getHours(), minute: today.getMinutes(), second: 0, day: n[0], month: n[1], year: ((n[2] > 60)?1900:2000)+n[2] };
				}
			} else {
				return false;
			}
		} else if (divisions === "// :") {
			if (strings[0].length != 4 || strings[1].length > 2 || strings[1].length > 2 || strings[2].length > 2 || strings[3].length > 2 || strings[4].length > 2) {
				return false
			} else {
				ret = { type: 13, hour: n[3], minute: n[4], second: 0, day: n[2], month: n[1], year: n[0] };
			}
		} else if (divisions === "// ::") {
			if (strings[0].length != 4 || strings[1].length > 2 || strings[1].length > 2 || strings[2].length > 2 || strings[3].length > 2 || strings[4].length > 2 || strings[5].length > 2) {
				return false
			} else {
				ret = { type: 14, hour: n[3], minute: n[4], second: n[5], day: n[2], month: n[1], year: n[0] };
			}
		} else {
			return false;
		}
		//console.log(ret.hour < 24 , ret.minute < 60 , ret.second < 60 , ret.day > 0 , ret.day < 32 , ret.month > 0 , ret.month < 13 , ((ret.year > 1700 && ret.year < 2200) || ret.year === 0));
		if (ret.hour < 24 && ret.minute < 60 && ret.second < 60 && ret.day > 0 && ret.day < 32 && ret.month > 0 && ret.month < 13 && ((ret.year > 1700 && ret.year < 2200) || ret.year === 0)) {
			return ret;
		}
		return false;
	}