Speaking about the Ubuntu iso images downloadable from the official sites [1,2],
with which timezone are they saved?
Getting some info from host and whois on old-releases.ubuntu.com and releases.ubuntu.com I obtain for both:
inetnum: 91.189.88.0 - 91.189.95.255
country: GB
But even with IP location finder [3] I found
91.189.88.17 United Kingdom Scotland Douglas
91.189.88.17 United Kingdom England London
...
91.189.88.148 United Kingdom Scotland Douglas
91.189.88.148 United Kingdom England London
...so have we to suppose GMT+1 even for the date/time of the file inside?
In brief
The timezone of http://releases.ubuntu.com is: GMT+1. You can verify it by calculating the difference from the http and the ftp protocol of the download site.
The release process
Following the release process steps, the whole release is build on an internal server, the iso are created and updated to the cdimage server, synced with the mirrors (at present 130), and the info on the various official sites updated.
Such a complex procedure cannot prescind from a timestamp synchronization. So it should be enough to infer the info from the download server.
(Moreover the production machine seems to belong to the same owner and seems to exit on internet in the same physical node of the distribution servers.)
The http protocol listing shows:
Icon Name Last modified Size Description
[DIR] 12.04.5/ 2017-05-17 00:42 - Ubuntu 12.04.5 LTS (Precise Pangolin)
[DIR] 12.04/ 2017-05-17 00:42 - Ubuntu 12.04.5 LTS (Precise Pangolin)
[DIR] 14.04.5/ 2017-02-16 22:30 - Ubuntu 14.04.5 LTS (Trusty Tahr)
[DIR] 14.04/ 2017-02-16 22:30 - Ubuntu 14.04.5 LTS (Trusty Tahr)
[DIR] 16.04.4/ 2018-03-01 19:58 - Ubuntu 16.04.4 LTS (Xenial Xerus)
[DIR] 16.04/ 2018-03-01 19:58 - Ubuntu 16.04.4 LTS (Xenial Xerus)
[DIR] 17.10.1/ 2018-01-12 05:38 - Ubuntu 17.10 (Artful Aardvark)
[DIR] 17.10/ 2018-01-12 05:38 - Ubuntu 17.10 (Artful Aardvark)
[DIR] 18.04/ 2018-04-06 02:17 - Ubuntu 18.04 (Bionic Beaver)
[DIR] artful/ 2018-01-12 05:38 - Ubuntu 17.10 (Artful Aardvark)
[DIR] bionic/ 2018-04-06 02:17 - Ubuntu 18.04 (Bionic Beaver)
[DIR] precise/ 2017-05-17 00:42 - Ubuntu 12.04.5 LTS (Precise Pangolin)
[DIR] trusty/ 2017-02-16 22:30 - Ubuntu 14.04.5 LTS (Trusty Tahr)
[DIR] ubuntu-core/ 2016-11-03 15:30 -
[DIR] xenial/ 2018-03-01 19:58 - Ubuntu 16.04.4 LTS (Xenial Xerus)
The ftp protocol listing shows:
Index of /releases/
[parent directory]
Name Size Date Modified
12.04 0 B 2/29/12, 7:00:00 PM
12.04.5 0 B 8/6/14, 8:00:00 PM
14.04 0 B 3/26/14, 8:00:00 PM
14.04.5 0 B 8/3/16, 8:00:00 PM
16.04 0 B 2/15/17, 7:00:00 PM
16.04.4 0 B 3/1/18, 2:54:00 PM
17.10 0 B 10/18/17, 8:00:00 PM
17.10.1 0 B 1/12/18, 12:36:00 AM
18.04 0 B 4/5/18, 10:15:00 PM
FOOTER.html 22 B 1/31/06, 7:00:00 PM
HEADER.html 2.4 kB 4/6/18, 5:28:00 AM
artful/ 1/12/18,12:38:00 AM
bionic/ 4/26/18,5:00:00 PM
cdicons/ 9/20/12, 8:00:00 PM
favicon.ico 1.1 kB 6/15/11, 8:00:00 PM
include/ 2/7/18, 4:40:00 PM
precise/ 5/16/17, 8:00:00 PM
releases 0 B 7/30/07, 8:00:00 PM
robots.txt 49 B 10/28/09, 8:00:00 PM
trusty/ 2/15/17, 7:00:00 PM
ubuntu-core/ 11/2/16, 8:00:00 PM
xenial/ 3/1/18, 2:58:00 PM
The HTTP protocol shows a difference is exactly 6 hours, which matches the timezone between where I leave in US/New York and the timezone of the UK.
Check with:
http://releases.ubuntu.com/releases
versus
ftp://releases.ubuntu.com/releases
This calculate the timezone to GMT+1
From my recollection, it has usually been after 12:00PM.
Here is a thread from the official Ubuntu Site:
1 Day Left to Ubuntu Release (But in which time zone ?)
The thread isn't new, but there appears to be a lot of consistency with my recollection. I only download the LTS versions on their release date.
I read the whole thread the other day. There were some references to a timezone of the Canonical. I just tried to look for the reference in the thread, but couldn't find it for a have hour.
A view of the thread might give some perspective of time reference.
A very important component to consider (also included in the link) is:
Pay particular attention to the last few hours of activity.
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