Time to update the database django

1  today's date may be with the following code:
 2  
. 3  Import datetime
 . 4  
. 5 Today = datetime.date.today ()
 . 6  
. 7  
. 8  
. 9  obtained may be yesterday's date:
 10  
. 11 Yesterday = Today - the datetime.timedelta (Days = 1 )
 12 is  
13 is  obtained tomorrow's date may be:
 14  
15 tomorrow Today + = the datetime.timedelta (Days =. 1)