The upstream (sysklogd) solution to the general issue of inconsistent
timestamps is to simply discard any timestamp included in messages and to
generate a new timestamp.  This patch is essentially a port of the relevant
upstream commit.

Reference:
Discard any timestamp information found in received syslog messages.
http://git.infodrom.org/?p=infodrom/sysklogd;a=commitdiff;h=4c09ec0516c08f62b1ed6c55d10424fe2da05808