Finding day of the week for a datetime64

Apologies if this is an easy one but I can’t see anything in the numpy documentation. I have a datetime64 and I’d like to find out which day of the week it is.

Unlike python datetime, datetime64 doesn’t seem to have a .weekday() function. However it does have a busday_offset() function, which implies it must know behind-the-scenes what day of the week a given date is. Any help greatly appreciated.

Answer

I think you could do in this way:

import numpy as np
import datetime
t = '2018-09-19'
t = np.datetime64(t)
day = t.astype(datetime.datetime).isoweekday()
print day

Output:

3