js获得本周，本月，本季度的开始日期和结束日期

<script>
var now = new Date();                    //当前日期
var nowDayOfWeek = now.getDay();         //今天本周的第几天
var nowDay = now.getDate();              //当前日
var nowMonth = now.getMonth();           //当前月
var nowYear = now.getYear();             //当前年
nowYear += (nowYear < 2000) ? 1900 : 0;  //

//格式化日期：yyyy-MM-dd
function formatDate(date) { 
	var myyear = date.getFullYear();
	var mymonth = date.getMonth()+1;
	var myweekday = date.getDate(); 
	
	if(mymonth < 10){
		mymonth = "0" + mymonth;
	} 
	if(myweekday < 10){
		myweekday = "0" + myweekday;
	}
	return (myyear+"-"+mymonth + "-" + myweekday); 
} 

//获得某月的天数
function getMonthDays(myMonth){
	var monthStartDate = new Date(nowYear, myMonth, 1); 
  	var monthEndDate = new Date(nowYear, myMonth + 1, 1); 
  	var   days   =   (monthEndDate   -   monthStartDate)/(1000   *   60   *   60   *   24); 
    return   days; 
}

//获得本季度的开始月份
function getQuarterStartMonth(){
	var quarterStartMonth = 0;
	if(nowMonth<3){
	   quarterStartMonth = 0;
	}
	if(2<nowMonth && nowMonth<6){
	   quarterStartMonth = 3;
	}
	if(5<nowMonth && nowMonth<9){
	   quarterStartMonth = 6;
	}
	if(nowMonth>8){
	   quarterStartMonth = 9;
	}
	return quarterStartMonth;
}

//获得本周的开始日期
function getWeekStartDate() { 
	var weekStartDate = new Date(nowYear, nowMonth, nowDay - nowDayOfWeek); 
	return formatDate(weekStartDate);
} 

//获得本周的结束日期
function getWeekEndDate() { 
	var weekEndDate = new Date(nowYear, nowMonth, nowDay + (6 - nowDayOfWeek)); 
	return formatDate(weekEndDate);
} 

//获得本月的开始日期
function getMonthStartDate(){
	var monthStartDate = new Date(nowYear, nowMonth, 1); 
	return formatDate(monthStartDate);
}

//获得本月的结束日期
function getMonthEndDate(){
  	var monthEndDate = new Date(nowYear, nowMonth, getMonthDays(nowMonth)); 
	return formatDate(monthEndDate);
}

//获得本季度的开始日期
function getQuarterStartDate(){
	
	var quarterStartDate = new Date(nowYear, getQuarterStartMonth(), 1); 
	return formatDate(quarterStartDate);
}

//或的本季度的结束日期
function getQuarterEndDate(){
	var quarterEndMonth = getQuarterStartMonth() + 2;
	var quarterStartDate = new Date(nowYear, quarterEndMonth, getMonthDays(quarterEndMonth)); 
	return formatDate(quarterStartDate);
}

alert(getQuarterEndDate());
</script>

 

评论

1 楼 anranran 2009-07-14  

var weekStartDate = new Date(nowYear, nowMonth, nowDay - nowDayOfWeek);不对吧,如果是周日,nowDayOfWeek为0,时间没变