If I do the following operation:
import numpy as np
np.datetime64('20230901') - np.datetime64('20230831')
I get the result
numpy.timedelta64(70,'Y')
I get that the letter ‘Y’ in this case means Year, but what does the 70 mean?
Furthermore, if I do the same operation specifying a time:
import numpy as np
np.datetime64('20230901-01') - np.datetime64('19700101-01')
I get the same number but in months:
numpy.timedelta64(840,'M')
What is the meaning of that amount of years/months?
>Solution :
numpy.datetime64 takes the YYYY-MM-DD format as input if you want to specify year-month-day, the dashes are important:
np.datetime64('2023-09-01') - np.datetime64('2023-08-31')
Output: numpy.timedelta64(1,'D')
Without them, the strings are interpreted as years, effectively having 20230901-20230831 = 70 years.