用python实现datetime(年月日时分秒)，儒略日（JD）、简化儒略日（MJD）相互转换。
# -*- coding: utf-8 -*- """ Created on Wed Dec 16 16:13:31 2020 @author: sunpuyu """ import datetime # 字符串转时间------------------------------------------------ # str format："2020 3 29 0 0 0[.000000]" []表示可有可无 def str2time(strTime): if len(strTime)>20:#暂时未用到 msec=int(float('0.' strTime[20:])*1000000) #微秒 str2=strTime[0:19] ' ' str(msec) return datetime.datetime.strptime(str2,'%Y %m %d %H %M %S %f') #datetime类转mjd 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)
#mjd和jd互转
def mjd2jd(mjd):
return mjd+2400000.5
def jd2mjd(jd):
return jd-2400000.5
if '__main__' == __name__:
strTime='2020 1 1 1 2 3.456789'
dateT=str2time(strTime)
mjd=time2mjd(dateT)
print(mjd)
print(mjd2time(mjd))