PYTHON

python day number from date

import datetime
date = '2021-05-21 11:22:03'
datem = datetime.datetime.strptime(date, "%Y-%m-%d %H:%M:%S")
print(datem.day)        # 25
print(datem.month)      # 5
print(datem.year)       # 2021
print(datem.hour)       # 11
print(datem.minute)     # 22
print(datem.second)     # 3

the day before today python datetime

from datetime import datetime, timedelta
    
d = datetime.today() - timedelta(days=days_to_subtract)

datetimes to day of year python

>>> import datetime
>>> today = datetime.datetime.now()
>>> print today
2009-03-06 15:37:02.484000
>>> today.strftime('%j')
'065'