python datetime to string iso 8601

from datetime import datetime
some_date = datetime.now()
iso_date_string = some_date.isoformat()

# For older version of python 
iso_date_string = some_date.strftime('%Y-%m-%dT%H:%M:%S.%f%z')

from datetime import datetime
my_date = datetime.now()
print(my_date.isoformat())

from datetime import datetime
my_date = datetime.now()
print(my_date.strftime('%Y-%m-%dT%H:%M:%S.%f%z'))