我制作这个出生日期计划可以让它更有效率吗？

Question

如果输入正确，程序只会超出出生日期。还有其他有效的方法吗？

while True:
user_input = input("Enter your date of birth in the following format DD/MM/YYYY: ")
DOB = user_input.split("/")
if len(DOB) == 3:
    day = DOB[0]
    month = DOB[1]
    year = DOB[2]
    try:
        if int(day) in range(1,32) and int(month) in range(1,13) and int(year) in range(1900,2018):
            print ("Thanks")
            break
        else:
            continue
    except:
        print ("Try again")

else:
    print ("Try again")