获取开始日期和上周的最后日期的Javascript

Question

可能重复：
Get first and last day of the week in JavaScript

任何机构可以建议我怎么可以给今天得到启动上周的日期和结束日期日期的功能？

Answer 1

以下是工作代码！希望这可以帮助任何人......！

var d = new Date(); 
     var to = d.setTime(d.getTime() - (d.getDay() ? d.getDay() : 7) * 24 * 60 * 60 * 1000); 
     var from = d.setTime(d.getTime() - 6 * 24 * 60 * 60 * 1000); 
alert(to); 
alert(from); 

Answer 2

可以使用Date.js

Date.today().previous().monday() 

可能是它为你工作。

Answer 3

获取该月的最后一天：

/** 
* Accepts either zero, one, or two parameters. 
*  If zero parameters: defaults to today's date 
*  If one parameter: Date object 
*  If two parameters: year, (zero-based) month 
*/ 
function getLastDay() { 
    var year, month; 
    var lastDay = new Date(); 

    if (arguments.length == 1) { 
     lastDay = arguments[0]; 
    } else if (arguments.length > 0) { 
     lastDay.setYear(arguments[0]); 
     lastDay.setMonth(arguments[1]); 
    } 

    lastDay.setMonth(lastDay.getMonth() + 1); 
    lastDay.setDate(0); 

    return lastDay; 
} 

获得的最后一个星期一：

/** 
* Accepts same parameters as getLastDay() 
*/ 
function getLastMonday() { 
    var lastMonday = getLastDay.apply(this, arguments); 
    lastMonday.setDate(lastMonday.getDate() - (lastMonday.getDay() == 0 ? 6 : (lastMonday.getDay() - 1))); 
    return lastMonday; 
} 

现在做你的工作，你可以做

/** 
* Accepts one parameter: Date object. 
* Assumes start of week is Sunday. 
*/ 
function getWeek(d) { 
    var jan1 = new Date(d.getFullYear(), 0, 1); 
    return Math.ceil((((d - jan1)/(24 * 60 * 60 * 1000)) + jan1.getDay() + 1)/7); 
} 

然后用

// Get the last week of this month: 
var lastWeekThisMonth = getWeek(getLastDay()); 
Alert("lastWeekThisMonth: %s", lastWeekThisMonth);