Python Programming Essentials - M23 - datetime module

Aug 19, 20140 likes1,455 views

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
1
Founder, P3 InfoTech Solutions Pvt. Ltd.
Python Programming Essentials

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Introduction to datetime module
2
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
3
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
4
All examples in these slides are using naive objects

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Date objects
5
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)
6
>>> from datetime import date
>>> date.today()
datetime.date(2013, 10, 21)

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Time objects
7
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
8
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
9
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)
10
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)
11
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)
12
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)
13
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
14

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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
15

The document provides a comprehensive overview of Python's datetime modules, detailing the use of classes like datetime.datetime, datetime.date, and datetime.timedelta for manipulating dates and times. It includes examples of methods for obtaining current time, formatting dates, and handling time zones. Additionally, it covers the calendar module's functionalities, such as printing calendars and checking for leap years.

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Python Programming Essentials - M23 - datetime module

1. http://www.skillbrew.com /SkillbrewTalent brewed by the industry itself Datetime module Pavan Verma @YinYangPavan 1 Founder, P3 InfoTech Solutions Pvt. Ltd. Python Programming Essentials

2. © SkillBrew http://skillbrew.com Introduction to datetime module 2 The datetime module supplies classes for manipulating dates and times Key classes in datetime module Date Time Datetime Timedelta tzinfo

3. © SkillBrew http://skillbrew.com Types of datetime objects Date and Time objects Naive objects Aware objects 3 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

4. © SkillBrew http://skillbrew.com Note 4 All examples in these slides are using naive objects

5. © SkillBrew http://skillbrew.com Date objects 5 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

6. © SkillBrew http://skillbrew.com Date objects (2) 6 >>> from datetime import date >>> date.today() datetime.date(2013, 10, 21)

7. © SkillBrew http://skillbrew.com Time objects 7 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

8. © SkillBrew http://skillbrew.com DateTime objects 8 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

9. © SkillBrew http://skillbrew.com Manipulating dates 9 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

10. © SkillBrew http://skillbrew.com Manipulating dates (2) 10 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

11. © SkillBrew http://skillbrew.com Manipulating dates (3) 11 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

12. © SkillBrew http://skillbrew.com Manipulating dates (4) 12 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

13. © SkillBrew http://skillbrew.com Manipulating dates (5) 13 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

14. © SkillBrew http://skillbrew.com Summary  Introduction to datetime module  Types of datetime objects  Date objects  Time objects  Datetime objects  Manipulating Dates 14

15. © SkillBrew http://skillbrew.com 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 15

Python Programming Essentials - M23 - datetime module

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