at the begining and end of each session with a loged window, and at the end and start of each day, mirc changes the date in a log
EX:
.:11·48·18:. * Disconnected
Session Close: Sun Mar 13 11:48:21 2005
Session Start: Sun Mar 13 11:48:53 2005
Session Ident: #sd
[%] Now talking in [#sd]
.:23·53·40:. ChanServ sets mode: +o FullBorg
Session Time: Sun Oct 02 00:00:00 2005
.:00·41·55:. «@[SD]» blah blah blah to geneerate some text