计算日期
........\date
........\....\date.cpp
........\....\date.dsp
........\....\date.dsw
........\....\date.h
........\....\date.ncb
........\....\date.opt
........\....\date.plg
........\....\Debug
........\....\.....\date.obj
........\....\.....\date.pdb
........\....\.....\mainfile.obj
........\....\.....\vc60.pdb
........\....\mainfile.cpp