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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
+```