def daysBetweenDates(year1, month1, day1, year2, month2, day2):
    monthsCommonYear = [ 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
    monthsLeapYear = [ 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
    daysCount = day2

    if checkLeapYear(year1): # days in first month
        daysCount += monthsLeapYear[month1 - 1] - day1
    else:
        daysCount += monthsCommonYear[month1 - 1] - day1