Package: jhead
Version: 2.70-1
Severity: normal
The man page incorrectly describes the format for giving a date and
time to -da:
For sub-day adjustments, a time of day can also be included, by
specifying yyyy:nn:dd+hh:mm or yyyy:mm:dd+hh:mm:ss
An hh:mm or hh:mm:ss specification seems to have no effect. For
example:
$ jhead DSCN0073.JPG | grep Date/Time
Date/Time : 2006:09:26 06:28:58 /* baseline to compare against */
$ jhead -da"2007:07:29+01:00:00-2007:07:29+00:00:00" DSCN0073.JPG
/* should have postponed exif time by one hour... */
$ jhead DSCN0073.JPG | grep Date/Time
Date/Time : 2006:09:26 06:28:58 /* oh no, same time as before */
/* the function jhead.c:ParseCmdDate() sscanf's using / as separator */
$ jhead -da"2007:07:29/01:00:00-2007:07:29/00:00:00" DSCN0073.JPG
Modified: DSCN0073.JPG /* a good omen */
$ jhead DSCN0073.JPG | grep Date/Time
Date/Time : 2006:09:26 07:28:58 /* one hour later (which is right) */
The problem is that jhead.c:ParseCmdDate() has this sscanf format:
a = sscanf(DateSpecified, "%d:%d:%d/%d:%d:%d", ...
So, according to the code, the date has to be separated from the time
by a /, whereas according to the man entry, it has to be separated by
a +. If one wants to change the man page (perhaps the simpler
choice), here is the simple patch:
--- jhead-2.70/jhead.1 2007-07-29 02:13:08.386466826 -0400
+++ jhead-2.70/jhead.1 2007-07-29 02:14:30.567119164 -0400
@@ -199,7 +199,7 @@
how many days the timestamp needs to be adjusted by, including leap years and
daylight
savings time changes.
The dates are specified as yyyy:mm:dd. For sub-day adjustments, a time of day
can also
-be included, by specifying yyyy:nn:dd+hh:mm or yyyy:mm:dd+hh:mm:ss
+be included, by specifying yyyy:nn:dd/hh:mm or yyyy:mm:dd/hh:mm:ss
Examples:
@@ -209,7 +209,7 @@
Default camera date is 2002:01:01, and date was reset on 2005:05:29 at 11:21 am
.br
-jhead -da2005:05:29+11:21-2002:01:01
+jhead -da2005:05:29/11:21-2002:01:01
.TP
.B \-ts
Sets the time stored in the Exif header to what is specified on the command
line.
[I built and installed the Debian unstable version of jhead to see
whether the problem persists, and it does, so I'm reporting the
problem on the Debian BTS even though I run an Ubuntu system.]
-- System Information:
Debian Release: 4.0
APT prefers feisty-updates
APT policy: (500, 'feisty-updates'), (500, 'feisty-security'), (500, 'feisty')
Architecture: i386 (i686)
Shell: /bin/sh linked to /bin/dash
Kernel: Linux 2.6.20-16-generic
Locale: LANG=en_US.utf8, LC_CTYPE=en_US.utf8 (charmap=UTF-8)
Versions of packages jhead depends on:
ii libc6 2.5-0ubuntu14 GNU C Library: Shared libraries
ii libjpeg-progs 6b-13 Programs for manipulating JPEG fil
jhead recommends no packages.
-- no debconf information
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