From ce101a0f8632f6b5390af247f3df2002e86becdf Mon Sep 17 00:00:00 2001
From: Vincent LE GOFF <g_n_s@hotmail.fr>
Date: Sun, 28 Apr 2019 01:07:11 +0200
Subject: http: Cookie improvements (denoland/deno_std#359)

Original: https://github.com/denoland/deno_std/commit/f1114691038888fc3d8995b64a8028f072569672
---
 datetime/mod.ts  | 39 +++++++++++++++++++++++++++++++++++++++
 datetime/test.ts |  9 +++++++++
 2 files changed, 48 insertions(+)

(limited to 'datetime')

diff --git a/datetime/mod.ts b/datetime/mod.ts
index a5c2648b0..4d627fcbe 100644
--- a/datetime/mod.ts
+++ b/datetime/mod.ts
@@ -1,4 +1,6 @@
 // Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+import { pad } from "../strings/pad.ts";
+
 export type DateFormat = "mm-dd-yyyy" | "dd-mm-yyyy" | "yyyy-mm-dd";
 
 /**
@@ -105,3 +107,40 @@ export function dayOfYear(date: Date): number {
 export function currentDayOfYear(): number {
   return dayOfYear(new Date());
 }
+
+/**
+ * Parse a date to return a IMF formated string date
+ * RFC: https://tools.ietf.org/html/rfc7231#section-7.1.1.1
+ * IMF is the time format to use when generating times in HTTP
+ * headers. The time being formatted must be in UTC for Format to
+ * generate the correct format.
+ * @param date Date to parse
+ * @return IMF date formated string
+ */
+export function toIMF(date: Date): string {
+  function dtPad(v: string, lPad: number = 2): string {
+    return pad(v, lPad, { char: "0" });
+  }
+  const d = dtPad(date.getUTCDate().toString());
+  const h = dtPad(date.getUTCHours().toString());
+  const min = dtPad(date.getUTCMinutes().toString());
+  const s = dtPad(date.getUTCSeconds().toString());
+  const y = date.getUTCFullYear();
+  const days = ["Sun", "Mon", "Tue", "Wed", "Thus", "Fri", "Sat"];
+  const months = [
+    "Jan",
+    "Feb",
+    "Mar",
+    "May",
+    "Jun",
+    "Jul",
+    "Aug",
+    "Sep",
+    "Oct",
+    "Nov",
+    "Dec"
+  ];
+  return `${days[date.getDay()]}, ${d} ${
+    months[date.getUTCMonth()]
+  } ${y} ${h}:${min}:${s} GMT`;
+}
diff --git a/datetime/test.ts b/datetime/test.ts
index 95bcd3653..f47914728 100644
--- a/datetime/test.ts
+++ b/datetime/test.ts
@@ -74,3 +74,12 @@ test(function DayOfYear(): void {
 test(function currentDayOfYear(): void {
   assertEquals(datetime.currentDayOfYear(), datetime.dayOfYear(new Date()));
 });
+
+test({
+  name: "[DateTime] to IMF",
+  fn(): void {
+    const actual = datetime.toIMF(new Date(Date.UTC(1994, 3, 5, 15, 32)));
+    const expected = "Tue, 05 May 1994 15:32:00 GMT";
+    assertEquals(actual, expected);
+  }
+});
-- 
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