Chrome Version       : 66.0.3359.181
OS Version: OS X 10.13.4
URLs (if applicable) : https://cdn.rawgit.com/jeffposnick/6b5c1137965ae37c914d1d7ca3ceba81/raw/da4b72dc907ef2c810d36c837f1a4c17a20be67b/index.html

What steps will reproduce the problem?
1. You can reproduce this by visiting the test page linked to above, or just calling 

    caches.open('my-cache')
      .then(c => c.put('/' + Date.now(), new Response('ignored'))); 

from any page.

What is the expected result?
When viewing the new cache entry in the DevTool's Application panel, the "Time Cached" column should be either empty, or ideally, set to the date corresponding to when cache.put() was called.

What happens instead of that?
The localized version epoch value of Jan 1, 1970 is used instead.

UserAgentString: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.181 Safari/537.36
 

Deleted: Screen Shot 2018-05-22 at 4.17.34 PM.png 101 KB

	Screen Shot 2018-05-22 at 4.17.34 PM.png 101 KB View Download