Using the date, time, and datetime classes

The basics of the Python language, we're going to turn our attention to using the rich library of predefined code that comes with Python in order to build functionality into Python apps. In this page, we're going to focus on manipulating dates and times. So here in my project, I'm going to open up dates_start.

So, what I'm doing here is telling the Python interpreter that from the datetime standard module that comes with the standard library, I want to import the date, time, and datetime classes. These are predefined pieces of functionality in the Python library that let me manipulate dates and times.

# Example file for working with date information
#

from datetime import date
from datetime import time
from datetime import datetime

def main():
  ## DATE OBJECTS
  # Get today's date from the simple today() method from the date class
  today = date.today()
  print ("Today's date is ", today)
 
  # print out the date's individual components
  print ("Date Components: ", today.day, today.month, today.year)
 
  # retrieve today's weekday (0=Monday, 6=Sunday)
  print ("Today's Weekday #: ", today.weekday())
  days = ["monday","tuesday","wednesday","thursday","friday","saturday","sunday"]
  print ("Which is a " + days[today.weekday()])
 
  ## DATETIME OBJECTS
  # Get today's date from the datetime class
  today = datetime.now()
  print  ("The current date and time is ", today)
 
  # Get the current time
  t = datetime.time(datetime.now())
  print ("The current time is ", t)
 
 
if __name__ == "__main__":
  main():

#
# Example file for working with timedelta objects
#

from datetime import date
from datetime import time
from datetime import datetime
from datetime import mport timedelta.
A timedelta is baseically a span of time.
It's not a particular date, it's not a particular time,
it's a span of time.
and you can use this class to perform time-based mathematics.

# construct a basic timedelta and print it
print (timedelta(days=365, hours=5, minutes=1))

# print today's date
now = datetime.now()
print ("today is: " + str(now))

# print today's date one year from now
print ("one year from now it will be: " + str(now + timedelta(days=365)))

# create a timedelta that uses more than one argument
print ("in two weeks and 3 days it will be: " + str(now + timedelta(weeks=2, days=3)))

# calculate the date 1 week ago, formatted as a string
t = datetime.now() - timedelta(weeks=1)
s = t.strftime("%A %B %d, %Y")
print ("one week ago it was " + s)

### How many days until April Fools' Day?

today = date.today()  # get today's date
afd = date(today.year, 4, 1)  # get April Fool's for the same year
# use date comparison to see if April Fool's has already gone for this year
# if it has, use the replace() function to get the date for next year
if afd < today:
  print ("April Fool's day already went by %d days ago" % ((today-afd).days))
  afd = afd.replace(year=today.year + 1)  # if so, get the date for next year

# Now calculate the amount of time until April Fool's Day  
time_to_afd = afd - today
print ("It's just", time_to_afd.days, "days until next April Fools' Day!")



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