[R] How to convert month-day-year to Julian data number?

[Paloma Moya]

Hello,
I am trying to convert calendar dates (Month, Day, Year) into Julian Days
 
Product code Bureau of Meteorology station number Month Day Year Date_mdy Date 
4102001 70014 1 1 1939 1/01/1939 1/01/1939 
4102001 70014 1 2 1939 1/02/1939 2/01/1939 
4102001 70014 1 3 1939 1/03/1939 3/01/1939 
4102001 70014 1 4 1939 1/04/1939 4/01/1939 
4102001 70014 1 5 1939 1/05/1939 5/01/1939 
4102001 70014 1 6 1939 1/06/1939 6/01/1939 
4102001 70014 1 7 1939 1/07/1939 7/01/1939 
 
These are the type of data that I have
 
 
I am trying to get the output as
 
Product code Bureau of Meteorology station number Month Day Year Date_mdy Date 
JD 
4102001 70014 1 1 1939 ######## ######## 215421 
4102001 70014 1 2 1939 ######## ######## 215422 
4102001 70014 1 3 1939 ######## ######## 215423 
4102001 70014 1 4 1939 ######## ######## 215424 
4102001 70014 1 5 1939 ######## ######## 215425 
4102001 70014 1 6 1939 ######## ######## 215426 
4102001 70014 1 7 1939 ######## ######## 215427 
 
(these JDs are fictions) 
 
I have tried to apply strftime, mdy.date etc … etc…
But I couldn’t… could you help me, please?
 
Thank you very much,
Paloma
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