datetime: timezone fix in toIMF (denoland/deno_std#400)

Original: https://github.com/denoland/deno_std/commit/49ae9439f71228326c1328d89502e437c00928fc

2 files changed, 10 insertions, 1 deletions

diff --git a/datetime/mod.ts b/datetime/mod.ts
index 4d627fcbe..1fd3b348f 100644
--- a/datetime/mod.ts
+++ b/datetime/mod.ts
@@ -140,7 +140,7 @@ export function toIMF(date: Date): string {
     "Nov",
     "Dec"
   ];
-  return `${days[date.getDay()]}, ${d} ${
+  return `${days[date.getUTCDay()]}, ${d} ${
     months[date.getUTCMonth()]
   } ${y} ${h}:${min}:${s} GMT`;
 }
diff --git a/datetime/test.ts b/datetime/test.ts
index f47914728..2c34e4fe8 100644
--- a/datetime/test.ts
+++ b/datetime/test.ts
@@ -83,3 +83,12 @@ test({
     assertEquals(actual, expected);
   }
 });
+
+test({
+  name: "[DateTime] to IMF 0",
+  fn(): void {
+    const actual = datetime.toIMF(new Date(0));
+    const expected = "Thus, 01 Jan 1970 00:00:00 GMT";
+    assertEquals(actual, expected);
+  }
+});