# Milliseconds in a Day
> Number of milliseconds in a day.
## Usage
```javascript
var MILLISECONDS_IN_DAY = require( '@stdlib/constants/time/milliseconds-in-day' );
```
#### MILLISECONDS_IN_DAY
Number of milliseconds in a day.
```javascript
var bool = ( MILLISECONDS_IN_DAY === 86400000 );
// returns true
```
## Notes
- The value is a generalization and does **not** take into account inaccuracies due to daylight savings conventions, crossing timezones, or other complications with time and dates.
## Examples
```javascript
var randu = require( '@stdlib/random/base/randu' );
var roundn = require( '@stdlib/math/base/special/roundn' );
var MILLISECONDS_IN_DAY = require( '@stdlib/constants/time/milliseconds-in-day' );
var ms;
var d;
var i;
function days2ms( days ) {
return days * MILLISECONDS_IN_DAY;
}
for ( i = 0; i < 10; i++ ) {
d = roundn( randu()*20.0, -2 );
ms = days2ms( d );
console.log( '%d days => %d milliseconds', d, ms );
}
```