def Verification():
date_format = "%d/%m/%Y"
if (datetime.strptime("1/1/2001", date_format) <= date_ < datetime.strptime("31/1/2008", date_format)):
print('bravo')
date_= datetime.strptime(date_,date_format)
vt=date_
vt =StringVar()
vt.set('')
lb = Label(parent, text = 'birth day: ')
cp = Entry(parent, textvariable=vt)
bt = Button(parent, text ='Verify', command = Verification)
lb.place(x=30, y=90)
cp.place(x=95, y=90)
bt.place(x=220,y=90)
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它的作業原理是這樣的：當Verify按鈕被按下時，該verification()函式將被呼叫，該函式最初將嘗試決議用戶輸入到datetime實體中的內容。如果它無法做到這一點，則會出現一條錯誤訊息。如果成功，那么它接下來會檢查它是否在所需的日期范圍內。同樣，如果不是，則顯示錯誤訊息。
from datetime import datetime
from tkinter import *
import tkinter.messagebox as messagebox
DATE_FORMAT = "%d/%m/%Y"
MIN_DATE = datetime.strptime('1/1/2001', DATE_FORMAT)
MAX_DATE = datetime.strptime('31/1/2008', DATE_FORMAT)
def verification():
try:
date_= datetime.strptime(vt.get(), DATE_FORMAT)
except ValueError:
messagebox.showerror('Invalid Date', f'"{vt.get()}"')
return
if MIN_DATE <= date_ < MAX_DATE: # Check date range.
messagebox.showinfo('Bravo', "You entered a valid date!")
else:
messagebox.showerror('Out of range', vt.get())
parent = Tk()
parent.geometry('300x200')
vt = StringVar(value='D/M/Y') # Initially show required format.
lb = Label(parent, text='birth day: ')
cp = Entry(parent, textvariable=vt)
bt = Button(parent, text ='Verify', command=verification)
lb.place(x=30, y=90)
cp.place(x=95, y=90)
bt.place(x=220,y=90)
parent.mainloop()
運行截圖：
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