[boost] BoostLog: how to write log files into different folders named under Year/Month/Day

Subject: [boost] BoostLog: how to write log files into different folders named under Year/Month/Day
From: Jinqiang Zhang (jasonzha_at_[hidden])
Date: 2011-04-29 04:43:35

e.g. like "%Y/%m/%d/xxx_%N.log"

when I tried it, it created folder named %Y, ... but what I what is '2011'
instead.

any idea ?

Jinqiang