Python: Convert a date of yyyy-mm-dd format to dd-mm-yyyy

Python Regular Expression: Exercise-25 with Solution

Write a Python program to convert a date of yyyy-mm-dd format to dd-mm-yyyy format.

Sample Solution:-

Python Code:

import re
def change_date_format(dt):
        return re.sub(r'(\d{4})-(\d{1,2})-(\d{1,2})', '\\3-\\2-\\1', dt)
dt1 = "2026-01-02"
print("Original date in YYY-MM-DD Format: ",dt1)
print("New date in DD-MM-YYYY Format: ",change_date_format(dt1))

Sample Output:

Original date in YYY-MM-DD Format:  2026-01-02                                                                
New date in DD-MM-YYYY Format:  02-01-2026 

Pictorial Presentation:

Python: Regular Expression - Convert a date of yyyy-mm-dd format to dd-mm-yyyy.


Flowchart: Regular Expression - Extract year, month and date from an url.

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Python: Tips of the Day

Getting the last element of a list:

some_list[-1] is the shortest and most Pythonic.

In fact, you can do much more with this syntax. The some_list[-n] syntax gets the nth-to-last element. So some_list[-1] gets the last element, some_list[-2] gets the second to last, etc, all the way down to some_list[-len(some_list)], which gives you the first element.

You can also set list elements in this way. For instance:

>>> some_list = [1, 2, 3]
>>> some_list[-1] = 5 # Set the last element
>>> some_list[-2] = 3 # Set the second to last element
>>> some_list
[1, 3, 5]

Note that getting a list item by index will raise an IndexError if the expected item doesn't exist. This means that some_list[-1] will raise an exception if some_list is empty, because an empty list can't have a last element.

Ref: https://bit.ly/3d8TfFP