Add Show to Date

docs/modules/Date.ts.md

@@ -17,6 +17,7 @@ Added in v2.0.0
 - [instances](#instances)
   - [Eq](#eq)
   - [Ord](#ord)
+  - [Show](#show)
   - [eqDate](#eqdate)
   - [eqMonth](#eqmonth)
   - [eqYear](#eqyear)
@@ -69,6 +70,24 @@ assert.deepStrictEqual(Ord.compare(new Date(1, 1, 2020), new Date(1, 1, 2021)),
 
 Added in v2.10.0
 
+## Show
+
+**Signature**
+
+```ts
+export declare const Show: Sh.Show<Date>
+```
+
+**Example**
+
+```ts
+import { Show } from 'fp-ts/Date'
+
+assert.deepStrictEqual(Show.show(new Date(2020, 0, 1)), '2020-01-01T00:00:00.000Z')
+```
+
+Added in v2.11.9
+
 ## eqDate
 
 **Signature**

src/Date.ts

@@ -6,6 +6,7 @@ import { pipe } from './function'
 import { IO } from './IO'
 import * as O from './Ord'
 import * as N from './number'
+import * as Sh from './Show'
 
 // -------------------------------------------------------------------------------------
 // instances
@@ -60,6 +61,19 @@ export const Ord: O.Ord<Date> =
     O.contramap((date) => date.valueOf())
   )
 
+/**
+ * @example
+ * import { Show } from 'fp-ts/Date'
+ *
+ * assert.deepStrictEqual(Show.show(new Date(2020, 0, 1)), '2020-01-01T00:00:00.000Z')
+ *
+ * @category instances
+ * @since 2.11.9
+ */
+export const Show: Sh.Show<Date> = {
+  show: (a) => a.toISOString()
+}
+
 // -------------------------------------------------------------------------------------
 // utils
 // -------------------------------------------------------------------------------------

test/Date.ts

@@ -33,6 +33,10 @@ describe('Date', () => {
     U.deepStrictEqual(_.Ord.compare(new Date(1), new Date(0)), 1)
   })
 
+  it('Show', () => {
+    U.deepStrictEqual(_.Show.show(new Date(0)), '1970-01-01T00:00:00.000Z')
+  })
+
   // -------------------------------------------------------------------------------------
   // utils
   // -------------------------------------------------------------------------------------