validating input dating

# Data the months with range of the days
months = {"January":range(31),"February":range(28),"March":range(31),
            "April":range(30),"May":range(31),"Juni":range(30),
            "July":range(31),"August":range(31),"September":range(30),
            "October":range(31),"November":range(30),"December":range(31)}

print("Please enter the year:")
year = input("Year.. 1900 - 2021 > ")

# Validating a year
while year not in range(1900,2021):
    try:
        year = int(year)
        if year not in range(1900,2021):
            print("Please enter a valid year. (1900-2020)")
            year = input("> ")
        else:
            # Considering February
            if year % 4 == 0:
                months["February"] = range(29)
    except:
        print("Please enter a valid year. (1900-2021)")
        year = input("again > ")


print("Enter your Month")
month = input("Month.. January - December > ")

# Validating the months
while month not in months:
    month = month.capitalize()
    if month not in months:
        print("Please enter a valid month :")
        month = input("Month  > ")


print("Enter your day")
day = input(" Day > ")

# Validating the day
while True:
    try:
        day = int(day)
        if day-1 not in months[month]:
            print("Please enter a valid day.")
            day = input("> ")
            continue
        else:
            break
    except:
        print("Please enter a valid day!")
        day = input("> ")


print(f"The date is {day} - {month} - {year}")