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分享LONG span = 273142800;
LONG days = span/(24*60*60);
span -= days*24*60*60;
int hours = span/(60*60);
span -= hours*60*60;
int min = span/60;
int sec = span%60;
CTimeSpan tmsp(days,hours,min,sec);
CTime tm(2009,8,27,13,30,0);
CTime pastTm;
pastTm = tm - tmsp;