JS date常用代码积累

Date.prototype.Format = function(fmt) {
        var o = {
            "M+" : this.getMonth()+1,                 //月份
            "d+" : this.getDate(),                    //日
            "h+" : this.getHours(),                   //小时
            "m+" : this.getMinutes(),                 //分
            "s+" : this.getSeconds(),                 //秒
            "q+" : Math.floor((this.getMonth()+3)/3), //季度
            "S"  : this.getMilliseconds()             //毫秒
        };
        if(/(y+)/.test(fmt))fmt=fmt.replace(RegExp.$1, (this.getFullYear()+"").substr(4 - RegExp.$1.length));
        for(var k in o) if(new RegExp("("+ k +")").test(fmt)) fmt = fmt.replace(RegExp.$1, (RegExp.$1.length==1) ? (o[k]) : (("00"+ o[k]).substr((""+ o[k]).length)));
        return fmt;
};

上述为日历format

下述为查找前一天的代码

function getYestoday(date){
	var yesterday_milliseconds=date.getTime()-1000*60*60*24;
	var yesterday = new Date();
	    yesterday.setTime(yesterday_milliseconds);     

	var strYear = yesterday.getFullYear();
	var strDay = yesterday.getDate();
	var strMonth = yesterday.getMonth()+1;
	if(strMonth<10)
	{
		strMonth="0"+strMonth;
	}
	datastr = strYear+"-"+strMonth+"-"+strDay;
	return datastr;
  }

  //获得上个月在昨天这一天的日期
  function getLastMonthYestdy(date){
     var daysInMonth = new Array([0],[31],[28],[31],[30],[31],[30],[31],[31],[30],[31],[30],[31]);
	 var strYear = date.getFullYear();
	 var strDay = date.getDate();
	 var strMonth = date.getMonth()+1;
	 if(strYear%4 == 0 && strYear%100 != 0){
		daysInMonth[2] = 29;
	 }
	 if(strMonth - 1 == 0)
	 {
		strYear -= 1;
		strMonth = 12;
	 }
	 else
	 {
		strMonth -= 1;
	 }
     strDay = daysInMonth[strMonth] >= strDay ? strDay : daysInMonth[strMonth];
	 if(strMonth<10)
	 {
		strMonth="0"+strMonth;
	 }
	 if(strDay<10)
	 {
		strDay="0"+strDay;
	 }
	 datastr = strYear+"-"+strMonth+"-"+strDay;
	 return datastr;
  }

  //获得上一年在昨天这一天的日期
  function getLastYearYestdy(date){
	 var strYear = date.getFullYear() - 1;
	 var strDay = date.getDate();
	 var strMonth = date.getMonth()+1;
	 if(strMonth<10)
	 {
		strMonth="0"+strMonth;
	 }
	 if(strDay<10)
	 {
		strDay="0"+strDay;
	 }
	 datastr = strYear+"-"+strMonth+"-"+strDay;
	 return datastr;
  }

　　

此为getTime()取得毫秒数的秘籍

var haomiao = +new Date();