CODEWITHSUNDEEP
javascriptdatedatetime
user3048401
user3048401

Reputation: 25

Unable to get expected result with Date() method in javascript

I am working on a music application. If a music file has been added then I should get the duration (which is in milliseconds) and convert the duration into minutes. 

var d = new Date(ms);
var hms = d.getMinutes().toString() +':'+ d.getSeconds().toString();

If I am providing ms = 331807;

expected answer is = 11:42 but the result is = 41:02
I am unable to figure out the problem. Can anyone please help me find the solution?

Upvotes: 0

Views: 55

Answers (2)

Matt Johnson-Pint
Matt Johnson-Pint

Reputation: 241858

The Date object expects milliseconds since Jan 1, 1970 UTC. However, the getMinutes and getSeconds functions will be output relative to the time zone that the code is running in.

If you want to use the Date object for this, you should use the getUTCMinutes and getUTCSeconds instead.

However, as others pointed out, this isn't the best use case for the Date object. You can do simple math to convert milliseconds to minutes and seconds.

Upvotes: 2

Josh Beam
Josh Beam

Reputation: 19802

The Date constructor instantiates a new object with an optional argument passed to it. Passing an amount of milliseconds to it gives you a new Date object, which is a date and time since the epoch, relative to the number of milliseconds you passed to it. getMinutes probably gave you 42, because the time you passed to the Date constructor was at the 42nd minute of whatever date was constructed.

You can convert milliseconds to minutes with simple multiplication. 

numberOfMilliseconds / (1000*60)

Upvotes: 1

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