Re: time server

[John Hasler <jhasler@debian.org>]

Paul E Condon writes:
> ...suppose you are looking at old emails in an archive. Suppose it
> matters to the minute when that old email was actually sent, like in a
> criminal or national intelligence investigation. Is there a database
> somewhere that records the dates of switching to and from summer time in
> each locale for each year in the past? For instance, time/dates from
> early March in the Mountain time zone were in MDT this year but should
> not be treated as MDT for the year 1980. How could an investigator, or
> historian/archivist, deal with this?

Here is an example:

  Received: from pop.newsguy.com [74.209.136.72]
	by toncho.dhh.gt.org with POP3 (fetchmail-6.3.8)
	for <mailagent@localhost> (single-drop); Fri, 27 Mar 2009 10:55:28 -0500 (CDT)

The "-500" tells you that the timestamp is five hours west of UTC.  The
fact that it is US CDT is irrelevant.
-- 
John Hasler