the ~ubuntu-branches import makes wrong timestamps (time zone mess)

Bug #475983 reported by Tormod Volden
This bug affects 3 people
Affects Status Importance Assigned to Milestone

Bug Description

The debian/changelog says "Tue, 13 Oct 2009 13:48:03 -0700".
The web interface says just "2009-10-13 14:48:03" which could be my local time (UTC+1) if the changelog date is mistaken as UTC by dropping the -0700.

Branching the repo, bzr log says "timestamp: Tue 2009-10-13 06:48:03 -0700" which is definitely wrong. So it seems it parses the changelog date as UTC ignoring the -0700, but still writes out the now wrong date in the original -0700 format.

James Westby (james-w)
affects: launchpad → bzr-builddeb
Changed in bzr-builddeb:
status: New → Confirmed
importance: Undecided → Medium
Revision history for this message
Anders Kaseorg (andersk) wrote :

The relevant code from is indeed confused:

            if use_time_from_changelog and len(cl._blocks) > 0:
                 raw_timestamp =
                 import rfc822, time
                 time_tuple = rfc822.parsedate_tz(raw_timestamp)
                 if time_tuple is not None:
                     timestamp = (time.mktime(time_tuple[:9]), time_tuple[9])
                 author = safe_decode(

time.mktime works in the system’s local time zone, which in general is different from the changelog entry’s time zone. The correct calculation is

timestamp = (calendar.timegm(time_tuple[:9]) - time_tuple[9], time_tuple[9])

Revision history for this message
Anders Kaseorg (andersk) wrote :

(Alternatively, this is what rfc822.mktime_tz is for, but that has a DST-related bug <> which was fixed in Python 3.2.4rc1 by making it work exactly how I just described.)

Jelmer Vernooij (jelmer)
Changed in brz-debian:
status: New → Triaged
importance: Undecided → Medium
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