DateType added

README.md

@@ -24,6 +24,15 @@ assert.strictEqual(T.encode(some(1)), 1)
 
 ## `Date`
 
+### `date`
+
+```ts
+import { date } from 'io-ts-types/lib/Date/date'
+
+const input = new Date(1973, 10, 30)
+date.decode(input) // right(new Date(...))
+```
+
 ### `DateFromISOString`
 
 ```ts

src/Date/date.ts

@@ -0,0 +1,16 @@
+import * as t from 'io-ts'
+import { identity } from 'fp-ts/lib/function'
+
+export class DateType extends t.Type<Date> {
+  readonly _tag: 'DateType' = 'DateType'
+  constructor() {
+    super(
+      'Date',
+      (m): m is Date => m instanceof Date,
+      (m, c) => (this.is(m) ? t.success(m) : t.failure(m, c)),
+      identity
+    )
+  }
+}
+
+export const date: DateType = new DateType()

src/index.ts

@@ -1,4 +1,5 @@
 // Date
+export { date, DateType } from './Date/date'
 export { DateFromISOString, DateFromISOStringType } from './Date/DateFromISOString'
 export { DateFromNumber, DateFromNumberType } from './Date/DateFromNumber'
 export { DateFromUnixTime, DateFromUnixTimeType } from './Date/DateFromUnixTime'

test/index.ts

@@ -5,6 +5,7 @@ import { iso } from 'newtype-ts'
 import { prismNonZero, NonZero } from 'newtype-ts/lib/NonZero'
 
 import {
+  date,
   DateFromISOString,
   DateFromNumber,
   DateFromUnixTime,
@@ -224,6 +225,16 @@ describe('number', () => {
 })
 
 describe('Date', () => {
+  describe('Date', () => {
+    it('should decode Date values', () => {
+      assert.deepEqual(date.decode(new Date(0)), right(new Date(0)))
+    })
+
+    it('should not decode non-Date values', () => {
+      assert.deepEqual(PathReporter.report(date.decode(1)), ['Invalid value 1 supplied to : Date'])
+    })
+  })
+
   it('DateFromISOString', () => {
     const T = DateFromISOString
     const d = new Date(1973, 10, 30)