js 计算快速统计中用到的日期

前言

最近在做统计报表模块，其中查询条件用到了快速查询，主要为了方便客户统计查询常用的几个日期纬度，比如本周、上周、本月、上月、昨日。 使用js计算，主要用到了js Date、 getDate()、getDay()， 代码包括格式化日期函数。

快速查询日期计算

function NewDate(str)
     {
         str=str.split('-');
         var date=new Date();
         date.setUTCFullYear(str[0], str[1]-1, str[2]);
         date.setUTCHours(0, 0, 0, 0);
         return date;

     }

//格式化日期格式    stime=stime.format("yyyyMMdd");
Date.prototype.format = function (format) {
	var o = {
		"M+": this.getMonth() + 1, //month
		"d+": this.getDate(), //day
		"h+": this.getHours(), //hour
		"m+": this.getMinutes(), //minute
		"s+": this.getSeconds(), //second
		"q+": Math.floor((this.getMonth() + 3) / 3), //quarter
		"S": this.getMilliseconds() //millisecond
	}
	if (/(y+)/.test(format)) format = format.replace(RegExp.$1,
	(this.getFullYear() + "").substr(4 - RegExp.$1.length));
	for (var k in o) if (new RegExp("(" + k + ")").test(format))
		format = format.replace(RegExp.$1,
		RegExp.$1.length == 1 ? o[k] :
		("00" + o[k]).substr(("" + o[k]).length));
	return format;
}

var curDateTime = new Date();
var nowYear = curDateTime.getFullYear();
var nowMonth = curDateTime.getMonth();
var nowDay = curDateTime.getDate();
var nowDayOfWeek = curDateTime.getDay();

console.log('year:'+nowYear+',month:'+nowMonth+',day:'+nowDay+',dayofweek:'+nowDayOfWeek);

var start=new Date(),end=new Date();
//1昨天
//curDateTime.setDate(curDateTime.getDate()-1);
//start=curDateTime.format("yyyyMMdd");
//end=curDateTime.format("yyyyMMdd");
//console.log("昨天:"+start+"  "+end);

//2前天
//curDateTime.setDate(curDateTime.getDate()-2);
//start=curDateTime.format("yyyyMMdd");
//end=curDateTime.format("yyyyMMdd");
//console.log("前天:"+start+"  "+end);

//本周
//start=new Date(nowYear,nowMonth,(nowDay-nowDayOfWeek+1));
//start=start.format("yyyyMMdd");
//end==new Date(nowYear,nowMonth,curDateTime.getDate());
//end=end.format("yyyyMMdd");
//console.log("本周:"+start+"  "+end);

//上周
//start=new Date(nowYear,nowMonth,(nowDay-nowDayOfWeek-6));
//start=start.format("yyyyMMdd");
//curDateTime.setDate(nowDay-nowDayOfWeek);
//end=curDateTime.format("yyyyMMdd");
//console.log("上周:"+start+"  "+end);

//本月
//start=curDateTime.format("yyyyMM01");
//本月的截至日期只统计到当前
//end=curDateTime.format("yyyyMMdd");
//console.log("本月:"+start+"  "+end);

//上月
start =new Date(nowYear,nowMonth-1,1);
start=start.format("yyyyMMdd");
end=new Date(nowYear,nowMonth,1);
end.setDate(end.getDate()-1);
end=end.format("yyyyMMdd");
console.log("上月:"+start+"  "+end);