1.獲取當前時間：

function getNowFormatDate() {
		    var date = new Date();
		    var seperator1 = "-";
		    var seperator2 = ":";
		    var year = date.getFullYear();
		    var month = date.getMonth() + 1;
		    var strDate = date.getDate();
		    if (month >= 1 && month <= 9) {
		        month = "0" + month;
		    }
		    if (strDate >= 0 && strDate <= 9) {
		        strDate = "0" + strDate;
		    }
		    var currentdate = year + seperator1 + month + seperator1 + strDate
		            + " " + date.getHours() + seperator2 + date.getMinutes()
		            + seperator2 + date.getSeconds();
		    return currentdate;
		}
 

2.獲取前N天時間：

function getBeforeDate(n){
		    var d = new Date();
		    var year = d.getFullYear();
		    var mon=d.getMonth()+1;
		    var day=d.getDate();
		    if(day <= n){
		            if(mon>1) {
		               mon=mon-1;
		            }
		           else {
		             year = year-1;
		             mon = 12;
		             }
		    }
		          d.setDate(d.getDate()-n);
		          year = d.getFullYear();
		          mon=d.getMonth()+1;
		          day=d.getDate();
		     s = year+"-"+(mon<10?('0'+mon):mon)+"-"+(day<10?('0'+day):day)+" "+d.getHours()+":"+d.getMinutes()
		     +":"+d.getSeconds();
		     return s;
		}