From 4b565133fe0684ed61e8f25f8a62781ff391f556 Mon Sep 17 00:00:00 2001
From: Luke Childs <lukechilds123@gmail.com>
Date: Sun, 8 Jan 2017 11:06:18 +0700
Subject: [PATCH] Throw error if Date header is missing

---
 src/index.js | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/index.js b/src/index.js
index 5104081..7a2baa9 100644
--- a/src/index.js
+++ b/src/index.js
@@ -19,6 +19,11 @@ expired.on = headers => {
 	// Parse headers if we got a raw string
 	headers = (typeof headers === 'string') ? parse(headers) : headers;
 
+	// Check we have date header
+	if (!headers.date) {
+		throw new Error('Date header is missing');
+	}
+
 	// Default to Date header
 	let expiredOn = new Date(headers.date);