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
import datetime
dt = datetime.datetime.today()
year = dt.year
month = dt.month
day = dt.day
>>> import datetime
>>> today = datetime.datetime.now()
>>> print today
2009-03-06 15:37:02.484000
>>> today.strftime('%j')
'065'
from datetime import datetime
day_of_year = datetime.now().timetuple().tm_yday
df['day_of_year'] = df['date_given'].dt.dayofyear
print(df)