In this tutorial, we will see how to convert days to seconds using JavaScript.

Before writing the program we should know that:

- There are
**24**hours in one day **60**minutes in an hour, and**60**seconds in a minute

So, to convert days into seconds we have to multiply the days by 24 to get hours, 60 for the minutes and 60 for the seconds.

`seconds = days * 24 * 60 * 60`

Let’s see it in code

```
const daysToSec = (days) => {
return days * 24 * 60 * 60;
}
console.log(daysToSec(1)) //86400
console.log(daysToSec(20)) //1728000
```

Here, we have created a function ** daysToSec()** , which take

**days**as an argument and converts the days into seconds.

If you input your days in decimal form, it will return the seconds in decimal.

```
const daysToSec = (days) => {
return days * 24 * 60 * 60;
}
console.log(daysToSec(1.534) + ' sec') //132537.6 sec
```

To solve this issue we have to use the Math.round() function of JavaScript.

The **Math.round()** function round a number to the nearest integer in JavaScript. For example,

```
Math.round(2.60); // 3
Math.round(4.50); // 5
Math.round(5.49); // 5
```

So we can modify the above `daysToSec()`

function to round up the value.

```
const daysToSec = (days) => {
return Math.round(days * 24 * 60 * 60);
}
console.log(daysToSec(1.534) + ' sec') //132538 sec
```

**Conclusion**: To convert days to seconds uisng JavaScript, we have to multiply the days by 24 hours, 60 minutes and 60 seconds i.e `days*24*60*60`

.

**Related Articles:**

Convert seconds to minutes and seconds (mm:ss) using JavaScript