a bunch of cleanups to the datetime stuff in irssi
removed the _get_day and _get_month functions and replaced them with a _get_day_and_month function
avoided a need for local time_t's and instead made the _get_day_and_month function return it
avoided allocating memory when it wasn't necessary
/*
* irssi - Implements several irssi features for Purple
* Copyright (C) 2005-2008 Gary Kramlich <grim@reaperworld.com>
* Copyright (C) 2006-2008 John Bailey <rekkanoryo@rekkanoryo.org>