Javascript 如何比较javascript中的两个字符串日期？
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how to compare two string dates in javascript?
提问by GLP
I have two string dates in the format of m/d/yyyy. For example, “11/1/2012”, “1/2/2013”. I am writing a function in JavaScript to compare two string dates. The signature of my function is
bool isLater(string1, string2),if the date passed by string1 is later than the date passed by string2, it will return true, otherwise false.
So, isLater(“1/2/2013”, “11/1/2012”) should return true. How do I write a JavaScript function for this?
我有两个格式为 m/d/yyyy 的字符串日期。例如，“11/1/2012”、“1/2/2013”。我正在用 JavaScript 编写一个函数来比较两个字符串日期。我的函数的签名是
bool isLater(string1, string2),如果string1传递的日期晚于string2传递的日期，则返回true，否则返回false。因此， isLater(“1/2/2013”, “11/1/2012”) 应该返回 true。我如何为此编写 JavaScript 函数？
回答by Garry
var d1 = Date.parse("2012-11-01");
var d2 = Date.parse("2012-11-04");
if (d1 < d2) {
alert ("Error!");
}
回答by Matt Zeunert
回答by fuyi
You can simply compare 2 strings
您可以简单地比较 2 个字符串
function isLater(dateString1, dateString2) {
return dateString1 > dateString2
}
Then
然后
isLater("2012-12-01", "2012-11-01")
returns true while
返回 true 而
isLater("2012-12-01", "2013-11-01")
returns false
返回假
回答by Steven Kuipers
Directly parsing a date string that is not in yyyy-mm-dd format, like in the accepted answerdoes not work. The answer by vitrandoes work but has some JQuery mixed in so I reworked it a bit.
直接解析不是 yyyy-mm-dd 格式的日期字符串，就像在接受的答案中一样不起作用。vitran的答案确实有效，但混入了一些 JQuery，因此我对其进行了一些修改。
// Takes two strings as input, format is dd/mm/yyyy
// returns true if d1 is smaller than or equal to d2
function compareDates(d1, d2){
var parts =d1.split('/');
var d1 = Number(parts[2] + parts[1] + parts[0]);
parts = d2.split('/');
var d2 = Number(parts[2] + parts[1] + parts[0]);
return d1 <= d2;
}
P.S. would have commented directly to vitran's post but I don't have the rep to do that.
PS 会直接评论 vitran 的帖子，但我没有代表这样做。
回答by vitran
If your date is not in format standar yyyy-mm-dd (2017-02-06) for example 20/06/2016. You can use this code
如果您的日期不是标准格式 yyyy-mm-dd (2017-02-06)，例如 20/06/2016。您可以使用此代码
var parts ='01/07/2016'.val().split('/');
var d1 = Number(parts[2] + parts[1] + parts[0]);
parts ='20/06/2016'.val().split('/');
var d2 = Number(parts[2] + parts[1] + parts[0]);
return d1 > d2
