Age_Calculator_GUI.py

# import all functions from the tkinter
from tkinter import *

#import Message Box module
from tkinter import messagebox

#import the Themed tk module
from tkinter import ttk

#import the time date module
from datetime import date

# 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 the age
def calculateAge():
    
    #check for error
    value = checkError()

    

    #if there is a error then value will be - 1
    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))


#The Driver Code 
if __name__ == '__main__':

    #Creating the GUI window
    root = Tk()

    #Setting the background color
    root.config(background='light green')

    #Setting the name of the GUI applications
    root.title('Age Calculator by Sahil Janbandhu')

    #Setting the geometry of the GUI application
    root.geometry('525x260')

    #Create the Date of birth : Label
    dob = Label(root, bg = 'blue')

    #Create the Given Date : Label
    givenDate = Label(root, text='Given Date', bg = 'blue')

    #Create the Given Date : Label
    birthDate = Label(root, text='Birth Date', bg = 'blue')

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

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

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

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

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

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

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

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

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

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

    # rsltYearField = Entry(root) 
    # rsltMonthField = Entry(root) 
    # rsltDayField = Entry(root)

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

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

    # 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)
    birthDate.grid(row = 0, column = 1) 
      
    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 
    root.mainloop()