Python 年月日、儒略日、年纪日互转函数

import datetime  def time2mjd(dateT):     t0=datetime.datetime(1858,11,17,0,0,0,0)#简化儒略日起始日     mjd=(dateT-t0).days     mjd_s=dateT.hour*3600.0 dateT.minute*60.0 dateT.second dateT.microsecond/1000000.0     return mjd mjd_s/86400.0  #mjd转datetime类 def mjd2time(mjd):     t0=datetime.datetime(1858,11,17,0,0,0,0)#简化儒略日起始日     return t0 datetime.timedelta(days=mjd)  def date2doy(date):     date_base = datetime.datetime(date.year,1,1)     doy = (date - date_base).days   1     return doy