How do we add and subtract Time using javascript

How do we add/subtract time using javascript?

I have two textboxes which displays time in this format ( 9:15 AM ).
All i want to do is subtract time from these ( i.e. 9:15 AM from 10:40 AM )


Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Hi. Try

a = '9:15 AM';
b = '10:40 AM';

var dummy_date = '2000 Jan 1 ';
var da = new Date(dummy_date + a);
var db = new Date(dummy_date + b);
var milliseconds = db.getTime() - da.getTime();

alert (milliseconds/60000 + " minutes have passed!");

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
Michel PlungjanIT ExpertCommented:
However watch it if the time is around daylight saving and goes over 2AM/3AM
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.