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# Constants
date-fns provides with a number of useful constants.
## Usage
The constants could be imported from `date-fns/constants` or directly
from `date-fns`:
```js
import { maxTime } from 'date-fns/constants'
import { minTime } from 'date-fns'
function isAllowedTime(time) {
return time <= maxTime && time >= minTime
}
```
## Constants
### `maxTime`
Maximum allowed time:
```js
import { maxTime } from 'date-fns'
const isValid = 8640000000000001 <= maxTime
//=> false
new Date(8640000000000001)
//=> Invalid Date
```
### `minTime`
Minimum allowed time:
```js
import { minTime } from 'date-fns'
const isValid = -8640000000000001 >= minTime
//=> false
new Date(-8640000000000001)
//=> Invalid Date
```
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