http - How browser correctly calculate epiration datetime of cookie with different timezone on server and client side -

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the server , client in different time zone. difference in 6 hours. server sets cookie 1 hour client correctly receives , keeps hour, although client 5 hours ago. how client correctly sets cookie on hour? browser looks @ header "date"? if so, if server behind proxy server, set own "date" header?

must provide proof reference rfc or where.

there 2 ways specify maximum age cookie:

max-age relative time of setting.. texpiration = tsetting + max-age

otherwise, expires attribute sets date / time value including timezone: http://tools.ietf.org/html/rfc6265#section-5.1.1

example rfc itself:

expires=wed, 09 jun 2021 10:18:14 gmt

there many standards (old , new) favor gmt (utc) date / time format:

from rfc2616 got called http format:

all http date/time stamps must represented in greenwich mean time (gmt), without exception. purposes of http, gmt equal utc (coordinated universal time).

the expires attribute should set time in http format:

e.g. set-cookie: reg_fb_gate=deleted; expires=thu, 01-jan-1970 00:00:01 gmt; path=/; domain=.example.com; httponly (from wikipedia)


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