Flash cards
Review the key moves
What is the main idea behind Python Datetime?
Lesson checks
Practice each idea before moving on
Short Mimo-style checks built from this lesson's code, terms, and sequence.
Which statement best captures the main point of this lesson?
Complete the missing token from the example code.
___ datetimePut the learning moves in the order that makes the concept easiest to apply.
Python Dates
A date in Python is not a data type of its own, but we can import a module named datetime to work with dates as date objects.
Example
import datetime
x = datetime.datetime.now()
print(x)Date Output
When we execute the code from the example above the result will be:
The date contains year, month, day, hour, minute, second, and microsecond.
The datetime module has many methods to return information about the date object.
Here are a few examples, you will learn more about them later in this chapter:
Example
import datetime
x = datetime.datetime.now()
print(x.year)
print(x.strftime("%A"))Creating Date Objects
To create a date, we can use the datetime() class (constructor) of the datetime module.
The datetime() class requires three parameters to create a date: year, month, day.
Example
import datetime
x = datetime.datetime(2020, 5, 17)
print(x)The datetime() class also takes parameters for time and timezone (hour, minute, second, microsecond, tzone), but they are optional, and has a default value of 0 , ( None for timezone).
The strftime() Method
The datetime object has a method for formatting date objects into readable strings.
The method is called strftime() , and takes one parameter, format , to specify the format of the returned string:
Example
import datetime
x = datetime.datetime(2018, 6, 1)
print(x.strftime("%B"))A reference of all the legal format codes:
| Directive | Description | Example |
|---|---|---|
| %a | Weekday, short version | Wed |
| %A | Weekday, full version | Wednesday |
| %w | Weekday as a number 0-6, 0 is Sunday | 3 |
| %d | Day of month 01-31 | 31 |
| %b | Month name, short version | Dec |
| %B | Month name, full version | December |
| %m | Month as a number 01-12 | 12 |
| %y | Year, short version, without century | 18 |
| %Y | Year, full version | 2018 |
| %H | Hour 00-23 | 17 |
| %I | Hour 00-12 | 05 |
| %p | AM/PM | PM |
| %M | Minute 00-59 | 41 |
| %S | Second 00-59 | 08 |
| %f | Microsecond 000000-999999 | 548513 |
| %z | UTC offset | +0100 |
| %Z | Timezone | CST |
| %j | Day number of year 001-366 | 365 |
| %U | Week number of year, Sunday as the first day of week, 00-53 | 52 |
| %W | Week number of year, Monday as the first day of week, 00-53 | 52 |
| %c | Local version of date and time | Mon Dec 31 17:41:00 2018 |
| %C | Century | 20 |
| %x | Local version of date | 12/31/18 |
| %X | Local version of time | 17:41:00 |
| %% | A % character | % |
| %G | ISO 8601 year | 2018 |
| %u | ISO 8601 weekday (1-7) | 1 |
| %V | ISO 8601 weeknumber (01-53) | 01 |