CODEWITHSUNDEEP
javascriptdatetime
8DK
8DK

Reputation: 714

what measure of time do i have here?

If the answer is 8. What is 8? milliseconds? or must I (time/100)-(ntime/100) to get milliseconds?

var time=(+new Date());

for(var i=0;i<100;i++){/*something intensive*/}

var ntime=(+new Date());

console.log('answer: '+((ntime)-time)+('( '+time+' , '+ntime+' )'));

answer: 8 / 1404573120333 >> 1404573120341

(+new Date()) A unix timestamp is described as the time in seconds since the epoch

Upvotes: 0

Views: 43

Answers (2)

Guffa
Guffa

Reputation: 700312

When turning the Date value into a number using the + operator, it will call the valueOf method. The value returned is the number of milliseconds since 1970-01-01 UTC.

"The valueOf method returns the primitive value of a Date object as a number data type, the number of milliseconds since midnight 01 January, 1970 UTC."

The valueOf method returns the same value as the getTime method. The doumentation for the getTime method has this example for measuring time in milliseconds:

var end, start;

start = new Date();
for (var i = 0; i < 1000; i++)
  Math.sqrt(i);
end = new Date();

console.log("Operation took " + (end.getTime() - start.getTime()) + " msec");

Upvotes: 1

Deleted User
Deleted User

Reputation: 2541

1404573825 would be epoch, seconds since jan1,1970.

1404573120333 is 3 digits longer, most likely milliseconds since jan1,1970

difference therefore too.

Upvotes: 1

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