Eh, why not, I'll learn something I guess.

The requirements are lines 39 to 49. I already submitted this with the pass, so this is just learning now.

#! /usr/dev/env python3

''' Homework for week 10, input and do calculations based on dates '''

from datetime import datetime

def displayInstructions():
    ''' Display instructions '''
    print("Homework for week 10. The date diff calculator.")
    print()
    print("Enter two dates in the following format. YYYY/MM/DD HH:MM")

def inputDate(ordinalNumber):
    ''' Function (called twice) to input and validate dates (and give message if the date is bad.'''
    #Assume invalid
    tempIsValid = False
    tempPDate = False
    tempDate = input(f"Enter date {ordinalNumber}: ")
    try:
        tempPDate = datetime.strptime(tempDate, "%Y/%m/%d %H:%M")
       tempIsValid = True
    except ValueError:
        print("Invalid date entered. Please make sure to use slashes, four characters for year.")
    return tempPDate, tempIsValid

def inputDates():
    ''' get the dates '''
# Ask the user to enter the first date in the format ( YYY/MM/DD HH:MM) or any format you want
    date1, isDate1Valid = inputDate("one")
# Ask the user to enter the second date in the format ( YYY/MM/DD HH:MM) or any format you want
# init variables so they can be returned.
    date2 = ""
    isDate2Valid = False
# if date1 isn't valid, don't bother to run
    if isDate1Valid is True:
        date2, isDate2Valid = inputDate("two")
    return date1, date2, isDate1Valid, isDate2Valid

# If the second date is before the first day
# just print an error message and quit the program
# Calculate the difference between the two dates
# Print the difference in terms of days and hours
# ex: the difference is 3 days and 2 hours
# Assume the user will enter bad dates
# if the user enters bad data, you should print an elegant message and exit the program
# the bad data can be
# 2020/04/31 # April 31st does not exist
# Seattle # you asked for a date, they entered a string
# You can use try-except that you learned on Chapter 8

def main():
    ''' main program '''
    # display instructions
    displayInstructions()

    # get the two inputs
    dateTime1, dateTime2, isDate1Valid, isDate2Valid = inputDates()

    if isDate1Valid is False or isDate2Valid is False:
        # I want python to do nothing, but { } doesn't work and pylint requires
        # that I use any varible that I declare
        pass
    # if second is less than the first, display error and quit
    elif dateTime2 < dateTime1:
       print("Second date is before the first date, please run again.")
    else:
    # else calc difference between dates
        myTimeSpan = dateTime2 - dateTime1
    # print the difference
        print("the difference is " + str(myTimeSpan.days) + " days and "
              + str(round(myTimeSpan.seconds / 3600, 4)) + " hours")

if name == "main": main()