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Python: Calculate number of days between two datetimes

Python Datetime: Exercise-33 with Solution

Write a Python program to calculate number of days between two datetimes.

Sample Solution:

Python Code:

import datetime
from datetime import datetime

def differ_days(date1, date2):
    a = date1
    b = date2
    return (a-b).days
print()
print(differ_days((datetime(2016,10,12,0,0,0)), datetime(2015,12,10,0,0,0)))
print(differ_days((datetime(2016,10,12,0,0,0)), datetime(2015,12,10,23,59,59)))
print()

Sample Output: 

307                                                                                                           
306

Flowchart:

Flowchart: Calculate number of days between two datetime.

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Python: Tips of the Day

Find current directory and file's directory:

To get the full path to the directory a Python file is contained in, write this in that file:

import os 
dir_path = os.path.dirname(os.path.realpath(__file__))

(Note that the incantation above won't work if you've already used os.chdir() to change your current working directory, since the value of the __file__ constant is relative to the current working directory and is not changed by an os.chdir() call.)

To get the current working directory use

import os
cwd = os.getcwd()

Documentation references for the modules, constants and functions used above:

  • The os and os.path modules.
  • The __file__ constant
  • os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountered in the path")
  • os.path.dirname(path) (returns "the directory name of pathname path")
  • os.getcwd() (returns "a string representing the current working directory")
  • os.chdir(path) ("change the current working directory to path")

Ref: https://bit.ly/3fy0R6m