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

29 Apr
2011
29 Apr
'11
8:43 a.m.
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
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Jinqiang Zhang