Best way to find the months between two dates

Michael Zippo

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I have the need to be able to accurately find the months between two dates in python. I have a solution that works but its not very good (as in elegant) or fast.

dateRange = [datetime.strptime(dateRanges[0], "%Y-%m-%d"), datetime.strptime(dateRanges[1], "%Y-%m-%d")]
months = [] 

tmpTime = dateRange[0]
oneWeek = timedelta(weeks=1)
tmpTime = tmpTime.replace(day=1)
dateRange[0] = tmpTime
dateRange[1] = dateRange[1].replace(day=1)
lastMonth = tmpTime.month
months.append(tmpTime)
while tmpTime < dateRange[1]:
    if lastMonth != 12:
        while tmpTime.month <= lastMonth:
            tmpTime += oneWeek
        tmpTime = tmpTime.replace(day=1)
        months.append(tmpTime)
        lastMonth = tmpTime.month

    else:
        while tmpTime.month >= lastMonth:
            tmpTime += oneWeek
        tmpTime = tmpTime.replace(day=1)
        months.append(tmpTime)
        lastMonth = tmpTime.month

So just to explain, what I"m doing here is taking the two dates and converting them from iso format into python datetime objects. Then I loop through adding a week to the start datetime object and check if the numerical value of the month is greater (unless the month is December then it checks if the date is less), If the value is greater I append it to the list of months and keep looping through until I get to my end date.

It works perfectly it just doesn"t seem like a good way of doing it...

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Best way to find the months between two dates del: Questions

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5 answers

I would like to know how to put a time delay in a Python script.

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Answer #1

import time
time.sleep(5)   # Delays for 5 seconds. You can also use a float value.

Here is another example where something is run approximately once a minute:

import time
while True:
    print("This prints once a minute.")
    time.sleep(60) # Delay for 1 minute (60 seconds).

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Answer #2

You can use the sleep() function in the time module. It can take a float argument for sub-second resolution.

from time import sleep
sleep(0.1) # Time in seconds

Best way to find the months between two dates del: Questions

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os.remove() removes a file.
os.rmdir() removes an empty directory.
shutil.rmtree() deletes a directory and all its contents.

Path objects from the Python 3.4+ pathlib module also expose these instance methods:

pathlib.Path.unlink() removes a file or symbolic link.
pathlib.Path.rmdir() removes an empty directory.

We hope this article has helped you to resolve the problem. Apart from Best way to find the months between two dates, check other __del__-related topics.

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Xu Nickolson

California | 2023-04-01

Maybe there are another answers? What Best way to find the months between two dates exactly means?. I am just not quite sure it is the best method

Davies Wu

Paris | 2023-04-01

Maybe there are another answers? What Best way to find the months between two dates exactly means?. I just hope that will not emerge anymore

Marie Wu

San Francisco | 2023-04-01

I was preparing for my coding interview, thanks for clarifying this - Best way to find the months between two dates in Python is not the simplest one. I am just not quite sure it is the best method