formatDate.js

function formatDate(d, mask) {
	var zeroize = function(value, length) {
		if(!length) length = 2;
		value = String(value);
		for(var i = 0, zeros = ''; i < (length - value.length); i++) {
			zeros += '0';
		}
		return zeros + value;
	};
	return mask.replace(/"[^"]*"|'[^']*'|\b(?:d{1,4}|m{1,4}|yy(?:yy)?|([hHMstT])\1?|[lLZ])\b/g, function($0) {
		switch($0) {
			case 'd':
				return d.getDate();
			case 'dd':
				return zeroize(d.getDate());
			case 'ddd':
				return ['Sun', 'Mon', 'Tue', 'Wed', 'Thr', 'Fri', 'Sat'][d.getDay()];
			case 'dddd':
				return ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'][d.getDay()];
			case 'M':
				return d.getMonth() + 1;
			case 'MM':
				return zeroize(d.getMonth() + 1);
			case 'MMM':
				return ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'][d.getMonth()];
			case 'MMMM':
				return ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'][d.getMonth()];
			case 'yy':
				return String(d.getFullYear()).substr(2);
			case 'yyyy':
				return d.getFullYear();
			case 'h':
				return d.getHours() % 12 || 12;
			case 'hh':
				return zeroize(d.getHours() % 12 || 12);
			case 'H':
				return d.getHours();
			case 'HH':
				return zeroize(d.getHours());
			case 'm':
				return d.getMinutes();
			case 'mm':
				return zeroize(d.getMinutes());
			case 's':
				return d.getSeconds();
			case 'ss':
				return zeroize(d.getSeconds());
			case 'l':
				return zeroize(d.getMilliseconds(), 3);
			case 'L':
				var m = d.getMilliseconds();
				if(m > 99) m = Math.round(m / 10);
				return zeroize(m);
			case 'tt':
				return d.getHours() < 12 ? 'am' : 'pm';
			case 'TT':
				return d.getHours() < 12 ? 'AM' : 'PM';
			case 'Z':
				return d.toUTCString().match(/[A-Z]+$/);
			default:
				return $0.substr(1, $0.length - 2);
		}
	});
}

// Date.prototype.format=function(mask){
// 	return formatDate(this,mask);
// };
export default formatDate;