# This file contains buggy code adapted by Max Hailperin <max@gustavus.edu>
# from  code that Microsoft apparently used in its original Zune.  The original
# was writtten in C rather than Python and was part of a larger procedure,
# but the essential control structure is as shown here.
#
# I've also made use of a Python library procedure, calendar.isleap(year),
# to test whether year is a leap year.  The original version contained
# the code for a procedure to do that test.

import calendar

def dayToYear(days):
    '''Return the year corresponding to a particular day.

    argument: days -- the day number starting with 1 for January 1, 1980'''

    year = 1980
    while days > 365:
        if calendar.isleap(year):
            if days > 366:
                days = days - 366
                year = year + 1
        else:
            days = days - 365
            year = year + 1
    return year