check time execution on client side

Question

Need to check time execution on client side

var start = new Date().getSeconds();
// code...
var end = new Date().getSeconds();
let time = end - start
console.log(time);

Result: 0;

I suppose it's a part of second, for example 0.05. How can I get it?

`Date.now()` gives you milliseconds (thousandths of a second) since The Epoch (midnight Jan 1st 1970 GMT). `performance.now()` gives you the same thing, theoretically with higher precision (through fractional numbers) although most browsers dialled that back after Spectre and Meltdown. There's also `console.time("label")` and `console.timeEnd("label")`, which report the interval between them. — T.J. Crowder, Mar 28 '19 at 08:20
Seconds are not a fine enough unit to measure this. Using `Date().getTime() - Date().getTime()` will give you the difference in milliseconds. — Brian Peacock, Mar 28 '19 at 08:22
In addtion to not being fine-grained enough, getSeconds() returns the number of seconds since the start of the current minute. If you start the timer shortly before the end of a minute, and finish early in the next minute, the second value can be smaller. Most of the time you will just get 0 or 1 as the result, but it could -58 or -59 as well. — T G, Mar 31 '19 at 06:53

score 0 · Answer 1 · answered Mar 28 '19 at 08:20

0

Use getTime() instead of getSeconds() and divide the difference by 1000.

var start = new Date().getTime();
for(let i = 0;i<100000;i++)
var end = new Date().getTime();
let time = (end - start)/1000
console.log(time);

answered Mar 28 '19 at 08:20

Maheer Ali

1 Answers1