使用 JavaScript 或 jQuery 获取当月的第一个和最后一个日期
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Get first and last date of current month with JavaScript or jQuery
提问by Moozy
As title says, I'm stuck on finding a way to get the first and last date of the current month with JavaScript or jQuery, and format it as:
正如标题所说，我一直在寻找一种方法来使用 JavaScript 或 jQuery 获取当月的第一个和最后一个日期，并将其格式化为：
For example, for November it should be :
例如，对于 11 月，它应该是：
var firstdate = '11/01/2012';
var lastdate = '11/30/2012';
回答by RobG
Very simple, no library required:
非常简单，不需要库：
var date = new Date();
var firstDay = new Date(date.getFullYear(), date.getMonth(), 1);
var lastDay = new Date(date.getFullYear(), date.getMonth() + 1, 0);
or you might prefer:
或者您可能更喜欢：
var date = new Date(), y = date.getFullYear(), m = date.getMonth();
var firstDay = new Date(y, m, 1);
var lastDay = new Date(y, m + 1, 0);
EDIT
编辑
Some browsers will treat two digit years as being in the 20th century, so that:
一些浏览器会将两位数的年份视为 20 世纪，因此：
new Date(14, 0, 1);
gives 1 January, 1914. To avoid that, create a Date then set its values using setFullYear:
给出 1 January, 1914. 为了避免这种情况，创建一个 Date 然后使用setFullYear设置它的值：
var date = new Date();
date.setFullYear(14, 0, 1); // 1 January, 14
回答by Moozy
I fixed it with Datejs
我用 Datejs
This is alerting the first day:
这是第一天的警报：
var fd = Date.today().clearTime().moveToFirstDayOfMonth();
var firstday = fd.toString("MM/dd/yyyy");
alert(firstday);
This is for the last day:
这是最后一天：
var ld = Date.today().clearTime().moveToLastDayOfMonth();
var lastday = ld.toString("MM/dd/yyyy");
alert(lastday);
