d.rodriguez d.rodriguez - 2 months ago 18
Javascript Question

Comparing two date values (as string) in javascript

I have a table of 'dates created' and this column is sort-able by ascending and descending order which I'm using Protractor/Jasmine in JavaScript to perform my tests.

Currently I was doing the following, which works, but I wasn't dealing with any dates that were created in the AM and then found my errors.

element.all(by.css('.ui-datatable-data > tr > td:nth-of-type(' + td + ')')).then(function (elements) {
for (i = 0; i < elements.length; i++) {
(function (index) {
elements[index].getText().then(function (text1) {
if (index != elements.length - 1) {
elements[index + 1].getText().then(function (text2) {
if (text2 != undefined && text1 != "") {
if (order == 'ascending') {
if (text1 < text2 || text1 == text2) {
expect(true).toBeTruthy();
}
else {
expect(text1 + ' was not less than ' + text2).toBe(false);
}
}
else if (order == 'descending') {
if (text1 > text2 || text1 == text2) {
expect(true).toBeTruthy();
}
else {
expect('text 1:' + text1 + '. Was not greater than:' + text2 + '.').toBe(false);
}
}
}
});
}
});
})(i);
}
});


I searched a little and found out that this method via javascript compares a string character by character. So in the example as follows:

Sep 6, 2016, 5:17:16 PM

Sep 7, 2016, 12:42:44 PM

The first date is less than the second date and my test would pass with the above method.


However in this example:

Sep 6, 2016, 5:17:16 PM

Sep 7, 2016, 12:42:44 AM


The first date is still less than the second date but once it gets to 'is P < A' it fails.


Similarly:

Sep 6, 2016, 5:17:16 PM

Sep 7, 2016, 2:42:44 PM


The first date is yet again less than the second but gets to 'is 5 < 2' and fails.

Is there a smarter/easier way to accomplish this? Or am I just really missing something here.

Answer

The date object will do exactly what you expect: Date Object

A small example using your sample data:

var date = new Date("Sep 6, 2016, 5:17:16 PM ");

var date2 = new Date("Sep 7, 2016, 12:42:44 AM");

console.log(date < date2); // true