RFC 2616 date/time stamps

Current date:

Thu, 29 Jun 2017 01:51:31 GMT

30 days from now:

Sat, 29 Jul 2017 01:51:31 GMT

365 days from now:

Fri, 29 Jun 2018 01:51:31 GMT

These are they dates you want to use in HTTP headers, such as Last-Modified and Expire, on the Internet.