在實際的運用中，每次登陸的時間不會是一個固定值，如何把老師寫的2015-0511改成系統時間？

#!/usr/bin/python
import?os
import?os.path
import?ConfigParser
class?student_info(object):
????def?__init__(self,recordfile):
????????self.logfile=recordfile
????????self.cfg=ConfigParser.ConfigParser()
????def?cfg_load(self):
????????self.cfg.read(self.logfile)
????def?cfg_dump(self):
????????se_list=self.cfg.sections()
????????print('============>')
????????for?se?in?se_list:
????????????print(se)
????????????print(self.cfg.items(se))
????????print('<============')
????def?delete_item(self,section,key):
????????self.cfg.remove_option(section,key)
????def?delete_section(self,section):
????????self.cfg.remove_section(section)
????def?add_section(self,section):
????????self.cfg.add_section(section)
????def?set_item(self,section,key,value):
????????self.cfg.set(section,key,value)
????def?save(self):
????????fp=open(self.logfile,'w')
????????self.cfg.write(fp)
????????fp.close()
if?__name__=='__main__':
????info=student_info('imooc.txt')
????info.cfg_load()
????info.cfg_dump()
????info.set_item('user?info','pwd','abc')
????info.cfg_dump()
????info.add_section('login')
????info.set_item('login','2015-0511','20')
????info.cfg_dump()
????info.save()