The document is about Python's datetime module. It introduces the module and the key classes it contains for manipulating dates and times, including Date, Time, and DateTime objects. It shows how to create datetime objects from these classes, extract attributes like year and hour, and perform operations like adding or subtracting days to manipulate dates. Examples are provided demonstrating common datetime tasks in Python like printing dates in different formats, finding today's date, and comparing datetime objects.

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Datetime module
Pavan Verma
@YinYangPavan
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Founder, P3 InfoTech Solutions Pvt. Ltd.
Python Programming Essentials

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Introduction to datetime module
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The datetime module supplies classes for
manipulating dates and times
Key classes in datetime module
Date Time Datetime Timedelta tzinfo

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Types of datetime objects
Date and Time
objects
Naive
objects
Aware
objects
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Naive objects are not
aware of time zones and
day-light savings but they
are pretty easy to
understand
An aware object has
sufficient knowledge of
time zones and day-light
savings

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Note
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All examples in these slides are using naive objects

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Date objects
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from datetime import date
d = date(2013, 8, 22)
print(d.year)
print(d.month)
print(d.day)
print(d.strftime("%Y %m %d"))
Output:
2013
8
22
2013 08 22

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Date objects (2)
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>>> from datetime import date
>>> date.today()
datetime.date(2013, 10, 21)

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Time objects
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from datetime import time
t = time(2, 30, 45)
print(t.hour)
print(t.minute)
print(t.second)
print(t.strftime("%H:%M:%S"))
Output:
2
30
45
02:30:45

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DateTime objects
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from datetime import datetime
dt = datetime(2013, 8, 21, 2, 30, 45)
print(dt.hour)
print(dt.minute)
print(dt.second)
print(dt.strftime("%m-%d-%Y %H:%M:%S"))
Output:
2
30
45
08-21-2013
02:30:45

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Manipulating dates
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from datetime import datetime, timedelta
dt = datetime(2013, 8, 21, 2, 30, 45)
print(dt.strftime("%m-%d-%Y %H:%M:%S"))
Output:
08-21-2013 02:30:45

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Manipulating dates (2)
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from datetime import datetime, timedelta
dt = datetime(2013, 8, 21, 2, 30, 45)
# get datetime after 5 days
add_dt = dt + timedelta(days=5)
print(add_dt.strftime("%m-%d-%Y %H:%M:%S"))
Output:
08-26-2013 02:30:45

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Manipulating dates (3)
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from datetime import datetime, timedelta
dt = datetime(2013, 8, 21, 2, 30, 45)
# get datetime after 5 days
add_dt = dt + timedelta(days=5)
# get datetime 2 days in past
sub_dt = dt - timedelta(days=2)
print(sub_dt.strftime("%m-%d-%Y %H:%M:%S"))
Output:
08-19-2013 02:30:45

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Manipulating dates (4)
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from datetime import datetime, timedelta
dt = datetime(2013, 8, 21, 2, 30, 45)
# get datetime after 5 days
add_dt = dt + timedelta(days=5)
# get datetime 2 days in past
sub_dt = dt - timedelta(days=2)
# comparison
print add_dt > sub_dt
Output:
True

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Manipulating dates (5)
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from datetime import datetime, timedelta
dt = datetime(2013, 8, 21, 2, 30, 45)
# get datetime after 5 days
add_dt = dt + timedelta(days=5)
# get datetime 2 days in past
sub_dt = dt - timedelta(days=2)
# comparison
add_dt > sub_dt
# subtract
print add_dt - sub_dt
Output:
7 days, 0:00:00

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Summary
 Introduction to datetime module
 Types of datetime objects
 Date objects
 Time objects
 Datetime objects
 Manipulating Dates
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Resources
 Datetime objects blog post
http://buddylindsey.com/python-date-and-datetime-
objects-getting-to-know-them/
 http://docs.python.org/2/library/datetime.html
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