export interface DateFromNumberC extends t.Type<Date, number, unknown> {}

export const DateFromNumber: DateFromNumberC = ...

import { DateFromNumber } from 'io-ts-types/lib/DateFromNumber'
import { right } from 'fp-ts/lib/Either'

const date = new Date(1973, 10, 30)
const input = date.getTime()
assert.deepStrictEqual(DateFromNumber.decode(input), right(date))