js date conversion: CST time and timestamp

1. Convert CST time to yyyy-MM-dd HH:mm:ss

dateFormat(date, format) {
    
    
			date = new Date(date);
			date.setHours(date.getHours() - 14);
			var dset = {
    
    
				"M+": date.getMonth() + 1, // 月
				"d+": date.getDate(), // 日
				"H+": date.getHours(), // 时
				"m+": date.getMinutes(), // 分
				"s+": date.getSeconds(), // 秒
				"q+": Math.floor((date.getMonth() + 3) / 3), // 刻钟
				S: date.getMilliseconds(), // 毫秒
			};

			if (/(y+)/.test(format)) {
    
    
				format = format.replace(RegExp.$1, (date.getFullYear() + "").substr(4 - RegExp.$1.length));
			}

			for (var i in dset) {
    
    
				if (new RegExp("(" + i + ")").test(format)) {
    
    
					format = format.replace(RegExp.$1, RegExp.$1.length == 1 ? dset[i] : ("00" + dset[i]).substr(("" + dset[i]).length));
				}
			}
			return format;
		},

2. The timestamp is converted to yyyy-MM-dd HH:mm:ss

	dateFormat(timestamp) {
    
    
			var date = new Date(timestamp);
			var Y = date.getFullYear() + "-";
			var M = (date.getMonth() + 1 < 10 ? "0" + (date.getMonth() + 1) : date.getMonth() + 1) + "-";
			var D = (date.getDate() < 10 ? "0" + date.getDate() : date.getDate()) + " ";
			var h = (date.getHours() < 10 ? "0" + date.getHours() : date.getHours()) + ":";
			var m = (date.getMinutes() < 10 ? "0" + date.getMinutes() : date.getMinutes()) + ":";
			var s = date.getSeconds() < 10 ? "0" + date.getSeconds() : date.getSeconds();
			return Y + M + D + h + m + s;
		},