不同月份的日子如何得到本周的第一天和最后一天？

Question

例如03/27/2016到04/02/2016，日期属于不同的月份。

var curr = new Date; // get current date
var first = curr.getDate() - curr.getDay();
var last = first + 6; // last day is the first day + 6

var firstday = new Date(curr.setDate(first)).toUTCString();
var lastday = new Date(curr.setDate(last)).toUTCString();

Answer 1

getDay 方法返回一周中的第几天，星期日为 0，星期六为 6。因此，如果您的一周从星期日开始，只需从当前日期减去当前天数（以天为单位）即可开始，加上 6 天就结束了，例如

function getStartOfWeek(date) {
  
  // Copy date if provided, or use current date if not
  date = date? new Date(+date) : new Date();
  date.setHours(0,0,0,0);
  
  // Set date to previous Sunday
  date.setDate(date.getDate() - date.getDay());
  
  return date;
}

function getEndOfWeek(date) {
  date = getStartOfWeek(date);
  date.setDate(date.getDate() + 6);
  return date; 
}
  
document.write(getStartOfWeek());

document.write('<br>' + getEndOfWeek())

document.write('<br>' + getStartOfWeek(new Date(2016,2,27)))

document.write('<br>' + getEndOfWeek(new Date(2016,2,27)))

Answer 2

您可以找到以下解决方案来解决您的问题。

let currentDate = new Date; // get current date
let first = currentDate.getDate() - currentDate.getDay();
var last = first + 6; // last day is the first day + 6
let firstDayWeek = new Date(currentDate.setDate(first)).toISOString();
var lastDayWeek = new Date(currentDate.setDate(last)).toISOString();
console.log(firstDayWeek, "first Day in week")
console.log(lastDayWeek, "end Day in week")     

Answer 3

我喜欢时刻库这种东西：

moment().startOf("week").toDate();
moment().endOf("week").toDate();

Answer 4

你可以试试这个：

var currDate = new Date();
day = currDate.getDay();
first_day = new Date(currDate.getTime() - 60*60*24* day*1000); 
last_day = new Date(currDate.getTime() + 60 * 60 *24 * 6 * 1000);