Question: I'm trying to get a difference between two dates in seconds. The logic would be like this :

* set an initial date which would be now;
* set a final date which would be the initial date plus some amount of seconds in future ( let's say 15 for instance )
* get the difference between those two ( the amount of seconds )

The reason why I'm doing it it with dates it's because the final date / time depends on some other variables and it's never the same ( it depends on how fast a user does something ) and I also store the initial date for other things.

I've been trying something like this : 

```
var _initial = new Date(),
    _initial = _initial.setDate(_initial.getDate()),
    _final = new Date(_initial);
    _final = _final.setDate(_final.getDate() + 15 / 1000 * 60);

var dif = Math.round((_final - _initial) / (1000 * 60));

```

The thing is that I never get the right difference. I tried dividing by `24 * 60` which would leave me with the seconds, but I never get it right. So what is it wrong with my logic ? I might be making some stupid mistake as it's quite late, but it bothers me that I cannot get it to work :)

Answer: 
Accurate and fast will give output in seconds:

```
 let startDate = new Date()
 let endDate = new Date("yyyy-MM-dd'T'HH:mm:ssZ");
 let seconds = Math.round((endDate.getTime() - startDate.getTime()) / 1000);

```
try using dedicated functions from high level programming languages. JavaScript `.getSeconds();` suits here:

```
var specifiedTime = new Date("November 02, 2017 06:00:00");
var specifiedTimeSeconds = specifiedTime.getSeconds(); 

var currentTime = new Date();
var currentTimeSeconds = currentTime.getSeconds(); 

alert(specifiedTimeSeconds-currentTimeSeconds);

```