Function isValidDate

isValidDate(date): date is Date
Checks if the given value is a valid Date object. A valid date is an instance of Date and has a non-NaN time value.
Parameters
- date: unknown
  The value to check.
Returns date is Date
True if the value is a valid Date, otherwise false.
Example
```
// => true
isValidDate(new Date())
```
Example
```
// => false
isValidDate(new Date(NaN))
```
Example
```
// => false
isValidDate('2014-02-31')
```
- Defined in src/is-valid-date/index.ts:20