Comparing 2 Times with DateJS

Question

I've seen a few different questions on here regarding finding the difference between using two different dates.

My question is similar to Parse ONLY a time string with DateJS.

I basically have 2 time inputs:

<input id="start_time" type="text"> <input id="end_time" type="text">

The format of these will always be: 07:15 AM or 08:30 AM

Essentially, what I am trying to do is ensure the start_time is not greater than the end_time.

I have tried using DateJS to parse the date, but it returns null:

Date.parseExact("03:15 PM", "HH:mm");    <--- returns null

How should I go about comparing the two input fields (using DateJS or something else) to ensure the start_time is not greater than the end_time?

Any help would be great.

The date string you're passing to `parseExact` doesn't match the format you're passing. — gen_Eric, Apr 16 '13 at 14:43

score 4 · Accepted Answer · answered Apr 16 '13 at 14:44

4

You need to add the AM/PM field to the format you're using to parse with. Try using

HH:mm tt

Instead of

HH:mm

answered Apr 16 '13 at 14:44

matthewtole

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Thank you, this is what I was trying to achieve. – Dodinas Apr 17 '13 at 12:48

score 1 · Answer 2 · answered Apr 16 '13 at 14:52

1

Not exactly answering the question, but DateJS looks a bit outdated. I would suggest you take a look at Moment.js, where you can do this:

moment("03:15 PM", "hh:mm A").isAfter(moment("03:05 PM", "hh:mm A"));
// false

answered Apr 16 '13 at 14:52

jgillich

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Thanks for the suggestion. This looks interesting, I'll have to check it out. – Dodinas Apr 17 '13 at 12:49

score 0 · Answer 3 · answered Apr 16 '13 at 15:04

0

Why not using toString?

var g = new Date("2012-01-11 03:15 PM");
console.log(g.toString('HH:mm'));

just add a ficticious date in order to obtain a valid date string format. Since I guess you just need the Time not the date

It works fine with me.

answered Apr 16 '13 at 15:04

kante

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score 0 · Answer 4 · answered Apr 16 '13 at 22:04

You can use Date.parseExact with the format revision presented by @matthewtole, or you should be able to just use 'Date.parse' as well.

Date.parseExact will provide better performance, but if you're just parsing two values, the performance improvement of Date.parseExact is probably not going to make much difference.

You can also use the .isBefore() function to check if one Date occurs before the other.

Example

var d1 = Date.parse("07:15 AM");
var d2 = Date.parse("08:30 AM");

d1.isBefore(d2); // true

Hope this helps

Comparing 2 Times with DateJS

4 Answers4