Convert calendar date to julian date - python

问题

I am trying to convert calendar date like so: '2018-08-07' to julian calendar day like so '219'. I have tried for a long time and seem to run out of ideas. The julian day calendar is this one I am using: https://landweb.modaps.eosdis.nasa.gov/browse/calendar.html

Still new to programming so I am trying to figure out where I went wrong. Appreciate your help, folks.

This is what I have so far:

from datetime import date
import datetime
from PyAstronomy import pyasl

df = datetime.datetime(2018, 8, 7, 12)
print(df)
jul = pyasl.jdcnv(df)
print(jul)

回答1:

You can use strftime for this (see this for a description of directives to use):

jul = df.strftime('%j')
>>> jul
'219'

来源：https://stackoverflow.com/questions/53107367/convert-calendar-date-to-julian-date-python