How to validate date in Python Tkinter using regex?

 

test1.py

from tkinter import *
from tkinter import messagebox
from test.regex import datevalidation

app=Tk()
app.geometry("500x400")
app.title("Hancie e-Learning Studio")


def check():
    txt = text.get()
    dateResult=datevalidation(txt)
    if dateResult==True:
        messagebox.showinfo("Info","The date is valid")
    else:
        messagebox.showerror("Error","Invalid date")


text=Entry(app,font=("Times New Roman",16))
text.pack()

btn=Button(app,text="Check Date",font=("Times New Roman",16), command=check)
btn.pack()


app.mainloop()

regex.py

import re

# Function to validate Gender
def datevalidation(date):

    # Regex to check valid date in yyyy-mm-dd format
    regex=re.compile("^([0-9]{4}[-/]?((0[13-9]|1[012])"
"[-/]?(0[1-9]|[12][0-9]|30)|(0[13578]|1[02])[-/]?31|02[-/]?(0[1-9]"
"|1[0-9]|2[0-8]))|([0-9]{2}(([2468][048]|[02468][48])|[13579][26])|"
    "([13579][26]|[02468][048]|0[0-9]|1[0-6])00)[-/]?02[-/]?29)$")
    if re.fullmatch(regex, date):
        dateResult=True
    else:
        dateResult=False

    return dateResult

Output