Slides from the training on the topic "Python Programming Essentials"

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/SkillbrewTalent brewed by the
industry itself
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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