Welcome folks today in this blog post we will be building a tkinter calendar widget inside tkinter to display dates inside the gui. All the full source code of the application is shown below.

Get Started

In order to get started we need to make an app.py file and copy paste the following code

app.py

import tkinter as Tkinter
import calendar
import time
import tkinter.font as TkFont
from tkinter import ttk


def sequence(*functions):  # to run 2 or more functions on button click
    for function in functions:
        function()


def update(y, m, tx, curdate):  # generate calendar with right colors
    calstr = calendar.month(y, m)
    tx.configure(state=Tkinter.NORMAL)
    tx.delete('0.0', Tkinter.END)  # remove previous calendar
    tx.insert(Tkinter.INSERT, calstr)
    for i in range(2, 9):
        tx.tag_add("others", '{}.0'.format(i), '{}.end'.format(i))  # tag days for coloring
        if len(tx.get('{}.0'.format(i), '{}.end'.format(i))) == 20:
            tx.tag_add("sun", '{}.end-2c'.format(i), '{}.end'.format(i))
    tx.tag_config("sun", foreground="#fb4622")
    tx.tag_config("others", foreground="#427eb5")
    tx.tag_add("head", '1.0', '1.end')
    if curdate[0] == y and curdate[1] == m:
        index = tx.search(str(curdate[2]), '2.0')  # search for today's date
        tx.tag_add("cur", index, '{}+2c'.format(index))  # highlight today's date
        tx.tag_config("cur", background="blue", foreground="white")
    tx.tag_config("head", font="arial", foreground="#0d8241", justify=Tkinter.CENTER)
    tx.configure(state=Tkinter.DISABLED)  # make text view not editable


top = Tkinter.Tk()
top.title("Calendar")
top.minsize(200, 200)
top.maxsize(250, 250)
curtime = time.localtime()
year = Tkinter.StringVar()
month = Tkinter.StringVar()
yearInt = curtime[0]
monthInt = curtime[1]
dateInt = curtime[2]
HLayout = ttk.PanedWindow(top, orient=Tkinter.HORIZONTAL)
ctx = Tkinter.Text(top, padx=10, pady=10, bg="#f3e9ae", relief=Tkinter.FLAT, height=9,
                   width=20)  # text view to passing to functions


def nextb():  # on click next button
    global monthInt, yearInt, ctx, curtime
    monthInt += 1
    if monthInt > 12:
        monthInt = monthInt % 12
        yearInt += 1
    update(yearInt, monthInt, ctx, curtime)


def prevb():  # on click previous button
    global monthInt, yearInt, ctx, curtime
    monthInt -= 1
    if monthInt < 1:
        monthInt = 12
        yearInt -= 1
    update(yearInt, monthInt, ctx, curtime)


def okcall():  # ok button click inside go to date window
    global monthInt, yearInt, ctx, curtime
    if (year.get().isdigit() and month.get().isdigit()) and (
                (0 < int(year.get()) < 10000) and (0 < int(month.get()) < 13)):
        yearInt = int(year.get())
        monthInt = int(month.get())
        update(yearInt, monthInt, ctx, curtime)


def gotod():  # go to date window creation
    newtop = Tkinter.Toplevel()
    newtop.title("Calendar")
    newtop.maxsize(190, 190)
    newtop.focus_set()
    newtop.tk.call('wm', 'iconphoto', newtop._w, logo)
    HLayout = ttk.PanedWindow(newtop, orient=Tkinter.HORIZONTAL)
    HLayout2 = ttk.PanedWindow(newtop, orient=Tkinter.HORIZONTAL)
    yearText = ttk.Label(HLayout, text="Year :")
    yearEdit = ttk.Entry(HLayout, textvariable=year)
    monthText = ttk.Label(HLayout2, text="Month:")
    monthEdit = ttk.Entry(HLayout2, textvariable=month)
    okb = ttk.Button(newtop, text="Ok", command=lambda: sequence(okcall, newtop.destroy))
    yearText.pack(side=Tkinter.LEFT)
    yearEdit.pack(side=Tkinter.RIGHT)
    monthText.pack(side=Tkinter.LEFT)
    monthEdit.pack(side=Tkinter.RIGHT)
    HLayout.pack()
    HLayout2.pack()
    okb.pack()
    newtop.mainloop()


def about_show():  # about window creation
    newtop = Tkinter.Toplevel()
    newtop.title("Calendar")
    newtop.maxsize(190, 190)
    newtop.focus_set()
    newtop.tk.call('wm', 'iconphoto', newtop._w, logo)
    about = ttk.LabelFrame(newtop, text="About")
    Tkinter.Label(about, text="Calendar 2.0").pack()
    Tkinter.Label(about, image=logo, text="Developer: Britalstar", compound=Tkinter.BOTTOM).pack()
    about.pack()
    newtop.mainloop()


update(yearInt, monthInt, ctx, curtime)  # for first run, generate calendar
prev = ttk.Button(HLayout, text="<<", command=prevb)
nex = ttk.Button(HLayout, text=">>", command=nextb)
goto = ttk.Button(top, text="Goto", command=gotod)
menubar = Tkinter.Menu(top, relief=Tkinter.FLAT)
filemenu = Tkinter.Menu(menubar, tearoff=0, relief=Tkinter.FLAT)
helpmenu = Tkinter.Menu(menubar, tearoff=0, relief=Tkinter.FLAT)
filemenu.add_command(label="Goto", command=gotod)
filemenu.add_separator()
filemenu.add_command(label="Exit", command=top.destroy)
helpmenu.add_command(label="About", command=about_show)
menubar.add_cascade(label="File", menu=filemenu)
menubar.add_cascade(label="Help", menu=helpmenu)
top.config(menu=menubar)
prev.pack(side=Tkinter.LEFT)
nex.pack(side=Tkinter.RIGHT)
ctx.pack()
HLayout.pack()
goto.pack()
top.mainloop()

Now if you execute the python script by typing the below command as shown below

python app.py