tkcalendar Calendar & Date selection

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At Command prompt enter pip install tkcalendar
pip install tkcalendar
import tkinter  as tk 
from tkinter import ttk
from tkcalendar import Calendar 
my_w = tk.Tk()
my_w.geometry("380x200")  
cal=Calendar(my_w,selectmode='day',year=2021,month=8,day=23)
cal.grid(row=1,column=1,padx=20)
my_w.mainloop()
tkcalendar date picker
If we don't specify any year , month or day then it will show current year month and day as default selected.
cal=Calendar(my_w,selectmode='day')
Take Date as user input through Calendar by using DateEntry

Collecting selected date: get_date()

tkcalendar get_date() to read date selection
We will read and display the selected date from the calendar. Note that we are not using any Click event of the button here to read and display the selected date. To trigger the event we are using String Variable trace method to monitor the change in value.

get_date() : Returns us the date as string ( We can't format this, check below selection_get() )
import tkinter  as tk 
from tkinter import ttk
from tkcalendar import Calendar 
my_w = tk.Tk()
my_w.geometry("380x200")  
sel=tk.StringVar()

cal=Calendar(my_w,selectmode='day',textvariable=sel)
cal.grid(row=1,column=1,padx=20)

def my_upd(*args): # triggered when value of string varaible changes
    l1.config(text=cal.get_date()) # read and display date

l1=tk.Label(my_w,bg='yellow')  # Label to display date 
l1.grid(row=1,column=2)

sel.trace('w',my_upd) # on change of string variable 
my_w.mainloop()

Reading Selected date on Button Click

Once the button ( b1) is clicked the function my_upd() is executed and the Label text option is updated with new selection by config() method.
tkcalendar get_date() on button click
import tkinter  as tk 
from tkinter import ttk
from tkcalendar import Calendar 
my_w = tk.Tk()
my_w.geometry("380x220")  

cal=Calendar(my_w,selectmode='day')
cal.grid(row=1,column=1,padx=20)

def my_upd(): # triggered on Button Click
    l1.config(text=cal.get_date()) # read and display date

l1=tk.Label(my_w,bg='yellow')  # Label to display date 
l1.grid(row=1,column=2)

b1=tk.Button(my_w,text='Read',command=lambda:my_upd())
b1.grid(row=2,column=1)
my_w.mainloop()

setting the selected value using selection_set()

We can set the default or change the selection of date to any value by using selection_set(). Input should be as datetime.date or as calendar local.
import tkinter  as tk 
from tkinter import ttk
from tkcalendar import Calendar
from  datetime import date
my_w = tk.Tk()
my_w.geometry("380x220")  

cal=Calendar(my_w,selectmode='day')
cal.grid(row=1,column=1,padx=15)

#dt=date(2021,8,19) # specific date Year, month , day
#cal.selection_set(dt) # Set the selected date 
cal.selection_set('8/16/2021') # Set the local calendar format
my_w.mainloop()

Changing the date format

To change the return date format we will use selection_get(), the selection_get() method return the selected date as a datetime.date instance. So we can change the format by using strftime().
In above code the changes inside the function my_upd() is here.
def my_upd(): # triggered on Button Click
    dt=cal.selection_get()
    str=dt.strftime("%d-%m-%Y") # format changed 
    l1.config(text=str) # read and display date
tkcalendar date format
str=dt.strftime("%d-%B-%Y") # format changed
Read the list of formats used in displaying Date & time
Calendar mindate & maxdate DateEntry DateEntry mindate & maxdate
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