RPM changelog date weirdness

[Michael Schwendt]

$  rpm -qi sylpheed|grep 'Build Date'
Release     : 3                             Build Date: Fri 24 Aug 2007 01:21:16 PM CEST

$ grep -B2 POP3 sylpheed.spec
%changelog
* Fri Aug 24 2007 Michael Schwendt <mschwendt[AT]users.sf.net> - 2.4.4-3
- Patch POP3 format string vulnerability CVE-2007-2958 (#254123).

But:

$ LANG=C rpm -q sylpheed --changelog|head -3
* Sat Aug 25 2007 Michael Schwendt <mschwendt[AT]users.sf.net> - 2.4.4-3
- Patch POP3 format string vulnerability CVE-2007-2958 (#254123).

*All* entries are off by one day forward. Bug or PEBKAC?