Weekdays Between Two Dates

July 5, 2013

Many programming languages provide a library function that calculates a serial number for each day, making it easy to calculate the number of days between two dates; we provide such a function in the Standard Prelude. Sometimes, though, the need is to calculate weekdays rather than total days.

Your task is to write a program that calculates the number of weekdays between two dates. When you are finished, you are welcome to read or run a suggested solution, or to post your own solution or discuss the exercise in the comments below.

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One Response to “Weekdays Between Two Dates”

  1. I found it most intuitive to break the count into whole weeks, days in first week, days in last week

    def get_weekdays_between_helper(d1,d2):
        diff = (d2 - d1).days
    
        dow1 = d1.isoweekday()
        dow2 = d2.isoweekday()
    
        dd1 = min (6, dow1)
        dd2 = min (6, dow2)
    
        # special case - in same week
        if diff < 7 and dow1 <= dow2:
            return (0,dd2 - dd1)
    
        whole_weeks = diff / 7
    
        if dow1 <= dow2:
            whole_weeks -= 1
    
        comps = (
            5 * whole_weeks,
            (6-dd1),
            + dd2-1)
    
        return sum(comps)
    

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