days.py

months = [
    ("January", 3),
    ("February", 0),
    ("March", 3),
    ("April", 2),
    ("May", 3),
    ("June", 2),
    ("July", 3),
    ("August", 3),
    ("September", 2),
    ("October", 3),
    ("November", 2),
    ("December", 3)
]

days = [
    "Monday",
    "Tuesday",
    "Wednesday",
    "Thursday",
    "Friday",
    "Saturday",
    "Sunday"
]

def day_to_number(day):
    if type(day) == str:
        for i in range(0, 7):
            if day == days[i]:
                return i
    else:
        return day

def day_to_text(day):
    return days[day]

def month_to_number(month):
    if type(month) == str:
        for i in range(0, 12):
            if month == months[i][0]:
                return i
    else:
        return month

def month_to_text(month):
    return months[month][0]


def get_future_day(ref_month, ref_date, ref_day, target_month, target_date):
    ref_day = day_to_number(ref_day)
    ref_month = month_to_number(ref_month)
    target_month = month_to_number(target_month)
    
    residual = 0
    i = ref_month
    while True:
        if i == target_month:
            break
        residual = (residual + months[i][1]) % 7
        i = (i + 1) % 12


    day = (ref_day + residual + (target_date - ref_date)) % 7
    return day_to_text(day)




print(get_future_day("March", 9, "Wednesday",
                    "June", 15))