Js 比較日期/時間的大小

獲取系統當前時間與自己寫的固定時間相比較，固定時間也可以從後臺傳過來，只需用${}接收一下就行啦，提示一下，後臺傳過來的必須是long類型的時間（1576032058000）

$(function(){
					var t;
					t = window.setInterval(function(){
						var nowDate = new Date();
						var year= nowDate.getFullYear();
						var month = nowDate.getMonth()+1;
						var today = nowDate.getDate();
						var hours = nowDate.getHours();
						var minutes = nowDate.getMinutes();
						var seconds = nowDate.getSeconds();
						if(month >= 1 && month <=9){month = "0" + month;}
						if(today >= 1 && today <=9){today = "0" + today;}
						var currentdate = year + "-" + month + "-" + today + " " + hours + ":" +minutes + ":" +seconds;
						var currentDateLong = new Date(currentdate.replace(new RegExp("-","gm"),"/")).getTime();//當前時間
						var settime=new Date("2019/12/11 10:41:30").getTime();//固定時間

						if(currentDateLong>settime){//當前時間大於指定時間
							stop();
						}else{
							console.log(currentDateLong);
						}
					}, 1000);
					
					function stop(){
						console.log("當前時間大於固定時間。停止計時");
						window.clearInterval(t);
					}
})

上一種是以時間戳的形式比較的，也就是數字。
這種是以時間格式來比較的，比較不了大小

function formatDate(date, format) {   
			        if (!date) return;   
			        if (!format) format = "yyyy-MM-dd HH:mm:ss";   
			        switch(typeof date) {   
			            case "string":   
			                date = new Date(date.replace(/-/, "/"));   
			                break;   
			            case "number":   
			                date = new Date(date);   
			                break;   
			        }    
			        if (!date instanceof Date) return;   
			        var dict = {   
			            "yyyy": date.getFullYear(),   
			            "M": date.getMonth() + 1,   
			            "d": date.getDate(),   
			            "H": date.getHours(),   
			            "m": date.getMinutes(),   
			            "s": date.getSeconds(),   
			            "MM": ("" + (date.getMonth() + 101)).substr(1),   
			            "dd": ("" + (date.getDate() + 100)).substr(1),   
			            "HH": ("" + (date.getHours() + 100)).substr(1),   
			            "mm": ("" + (date.getMinutes() + 100)).substr(1),   
			            "ss": ("" + (date.getSeconds() + 100)).substr(1)   
			        };       
			        return format.replace(/(yyyy|MM?|dd?|HH?|ss?|mm?)/g, function() {   
			            return dict[arguments[0]];   
			        });                   
			    }
				$(function(){
					if(formatDate(new Date(),"yyyy-MM-dd") == "2019-12-15" ){
				    	alert(當前日期等於固定的日期);
				    }
				})