当日期在不同月份时，如何获取当前一周的第一天和最后一天?

问题描述

例如，对于2016年3月27日至2016年2月4日，日期位于不同的月份.

For example, in the case of 03/27/2016 to 04/02/2016, the dates fall in different months.

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();

推荐答案

getDay 方法返回星期几，星期天为0，星期六为6.因此，如果您的星期是从星期天开始，只需从当前日期中减去以天为单位的当前天数即可开始，并加上6天即可获得结束，例如

The getDay method returns the number of the day in the week, with Sunday as 0 and Saturday as 6. So if your week starts on Sunday, just subtract the current day number in days from the current date to get the start, and add 6 days get the end, e.g.

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)))

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