The mod_log_config time formats which can be used in %{...}t format arguments to the LogFormat and CustomLog directives vary by platform.

Platform

Link to list of available %{...}t codes (i.e. strftime codes)

Linux

http://www.gnu.org/software/libc/manual/html_node/Formatting-Calendar-Time.html#index-strftime-2660

Windows

http://msdn2.microsoft.com/en-us/library/fe06s4ak%28VS.80%29.aspx

AIX

http://publib.boulder.ibm.com/infocenter/systems/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf2/strftime.htm

Solaris

http://docs.sun.com/app/docs/doc/819-2243/6n4i099ji

HP-UX

http://docs.hp.com/en/B2355-60105/strftime.3C.html

Netware

http://developer.novell.com/documentation/libc/libc_vol2/data/sdk1810.html#sdk1810