Age-Calculator

import all functions from the tkinter

from tkinter import *

import messagebox class from tkinter

from tkinter import messagebox

Function for clearing the

contents of all text entry boxes

def clearAll() :

# deleting the content from the entry box 
dayField.delete(0, END) 
monthField.delete(0, END) 
yearField.delete(0, END) 
givenDayField.delete(0, END) 
givenMonthField.delete(0, END) 
givenYearField.delete(0, END) 
rsltDayField.delete(0, END) 
rsltMonthField.delete(0, END) 
rsltYearField.delete(0, END) 

function for checking error

def checkError() :

# if any of the entry field is empty 
# then show an error message and clear  
# all the entries 
if (dayField.get() == "" or monthField.get() == "" 
    or yearField.get() == "" or givenDayField.get() == "" 
    or givenMonthField.get() == "" or givenYearField.get() == "") : 

    # show the error message 
    messagebox.showerror("Input Error") 

    # clearAll function calling 
    clearAll() 
      
    return -1

function to calculate Age

def calculateAge() :

# check for error 
value = checkError() 

# if error is occur then return 
if value ==  -1 : 
    return
  
else : 
      
    # take a value from the respective entry boxes 
    # get method returns current text as string 
    birth_day = int(dayField.get()) 
    birth_month = int(monthField.get()) 
    birth_year = int(yearField.get()) 

    given_day = int(givenDayField.get()) 
    given_month = int(givenMonthField.get()) 
    given_year = int(givenYearField.get()) 
      
      
    # if birth date is greater then given birth_month  
    # then donot count this month and add 30 to the date so  
    # as to subtract the date and get the remaining days  
    month =[31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31] 
      
    if (birth_day > given_day): 
        given_month = given_month - 1
        given_day = given_day + month[birth_month-1]  
                  
                  
    # if birth month exceeds given month, then  
    # donot count this year and add 12 to the  
    # month so that we can subtract and find out  
    # the difference  
    if (birth_month > given_month): 
        given_year = given_year - 1
        given_month = given_month + 12
                  
    # calculate day, month, year  
    calculated_day = given_day - birth_day;  
    calculated_month = given_month - birth_month;  
    calculated_year = given_year - birth_year; 

    # calculated day, month, year write back 
    # to the respective entry boxes 

    # insert method inserting the   
    # value in the text entry box. 
      
    rsltDayField.insert(10, str(calculated_day)) 
    rsltMonthField.insert(10, str(calculated_month)) 
    rsltYearField.insert(10, str(calculated_year)) 

Driver Code

if name == "main" :

# Create a GUI window 
gui = Tk() 

# Set the background colour of GUI window   
gui.configure(background = "light green") 

# set the name of tkinter GUI window  
gui.title("Age Calculator") 

 # Set the configuration of GUI window 
gui.geometry("525x260") 

# Create a Date Of Birth : label  
dob = Label(gui, text = "Date Of Birth", bg = "blue") 

# Create a Given Date : label 
givenDate = Label(gui, text = "Given Date", bg = "blue") 

# Create a Day : label 
day = Label(gui, text = "Day", bg = "light green") 

# Create a Month : label 
month = Label(gui, text = "Month", bg = "light green") 

# Create a Year : label 
year = Label(gui, text = "Year", bg = "light green") 

# Create a Given Day : label 
givenDay = Label(gui, text = "Given Day", bg = "light green") 

# Create a Given Month : label 
givenMonth = Label(gui, text = "Given Month", bg = "light green") 

# Create a Given Year : label 
givenYear = Label(gui, text = "Given Year", bg = "light green") 

# Create a Years : label 
rsltYear = Label(gui, text = "Years", bg = "light green") 

# Create a Months : label 
rsltMonth = Label(gui, text = "Months", bg = "light green") 

# Create a Days : label 
rsltDay = Label(gui, text = "Days", bg = "light green") 

# Create a Resultant Age Button and attached to calculateAge function 
resultantAge = Button(gui, text = "Resultant Age", fg = "Black", bg = "Red", command = calculateAge) 

# Create a Clear All Button and attached to clearAll function 
clearAllEntry = Button(gui, text = "Clear All", fg = "Black", bg = "Red", command = clearAll) 

# Create a text entry box for filling or typing the information.   
dayField = Entry(gui) 
monthField = Entry(gui) 
yearField = Entry(gui) 
  
givenDayField = Entry(gui) 
givenMonthField = Entry(gui) 
givenYearField = Entry(gui) 
  
rsltYearField = Entry(gui) 
rsltMonthField = Entry(gui) 
rsltDayField = Entry(gui) 


# grid method is used for placing   
# the widgets at respective positions   
# in table like structure . 
dob.grid(row = 0, column = 1) 
  
day.grid(row = 1, column = 0) 
dayField.grid(row = 1, column = 1) 
  
month.grid(row = 2, column = 0) 
monthField.grid(row = 2, column = 1) 
  
year.grid(row = 3, column = 0) 
yearField.grid(row = 3, column = 1) 
  
givenDate.grid(row = 0, column = 4) 
  
givenDay.grid(row = 1, column = 3) 
givenDayField.grid(row = 1, column = 4) 
  
givenMonth.grid(row = 2, column = 3) 
givenMonthField.grid(row = 2, column = 4) 
  
givenYear.grid(row = 3, column = 3) 
givenYearField.grid(row = 3, column = 4) 
  
resultantAge.grid(row = 4, column = 2) 
  
rsltYear.grid(row = 5, column = 2) 
rsltYearField.grid(row = 6, column = 2) 
  
rsltMonth.grid(row = 7, column = 2) 
rsltMonthField.grid(row = 8, column = 2) 
  
rsltDay.grid(row = 9, column = 2) 
rsltDayField.grid(row = 10, column = 2) 

clearAllEntry.grid(row = 12, column = 2) 

# Start the GUI 
gui.mainloop()