isDate()function

isDate(value: unknown): value is Date

Param	Type
`value`	`unknown`	The value to check. required

Return
`value is Date`	`true` if the value is a `Date` instance representing a valid date, narrowing it to `Date`.

Is a value a valid Date instance?

Note: Date instances can be invalid (e.g. new Date("blah blah").getTime() returns NaN). These are detected and will always return false