how to compare two string dates in javascript?
JavascriptDateJavascript Problem Overview
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?
Javascript Solutions
Solution 1 - Javascript
var d1 = Date.parse("2012-11-01");
var d2 = Date.parse("2012-11-04");
if (d1 < d2) {
alert ("Error!");
}
Recently found out from a comment you can directly compare strings like below
if ("2012-11-01" < "2012-11-04") {
alert ("Error!");
}
Solution 2 - Javascript
You can simply compare 2 strings
function isLater(dateString1, dateString2) {
return dateString1 > dateString2
}
Then
isLater("2012-12-01", "2012-11-01")
returns true while
isLater("2012-12-01", "2013-11-01")
returns false
Solution 3 - Javascript
Parse the dates and compare them as you would numbers:
function isLater(str1, str2)
{
return new Date(str1) > new Date(str2);
}
If you need to support other date format consider a library such as date.js.
Solution 4 - Javascript
Directly parsing a date string that is not in yyyy-mm-dd format, like in the accepted answer does not work. The answer by vitran does work but has some JQuery mixed in so I reworked it a bit.
// 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.
Solution 5 - Javascript
If your date is not in format standar yyyy-mm-dd (2017-02-06) for example 20/06/2016. You can use this code
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
Solution 6 - Javascript
You can use "Date.parse()" to properly compare the dates, but since in most of the comments people are trying to split the string and then trying to add up the digits and compare with obviously wrong logic -not completely.
Here's the trick. If you are breaking the string then compare the parts in nested format.
Compare year with year, month with month and day with day.
<pre><code>
var parts1 = "26/07/2020".split('/');
var parts2 = "26/07/2020".split('/');
var latest = false;
if (parseInt(parts1[2]) > parseInt(parts2[2])) {
latest = true;
} else if (parseInt(parts1[2]) == parseInt(parts2[2])) {
if (parseInt(parts1[1]) > parseInt(parts2[1])) {
latest = true;
} else if (parseInt(parts1[1]) == parseInt(parts2[1])) {
if (parseInt(parts1[0]) >= parseInt(parts2[0])) {
latest = true;
}
}
}
return latest;
</code></pre>