How to Create a Date Picker in Tkinter

Tkinter Date Picker

First you have to install tkcalendar by saying this, in your terminal:

pip install tkcalendar

Here is a simple example on tkcalendars DateEntry:

from tkinter import *
from tkinter import ttk
from tkcalendar import DateEntry

root = Tk()

e7 = DateEntry(root, values="Text", year=2020, state="readonly", date_pattern="yyyy-mm-dd")
e7.grid(row=1, column=1, padx=20, pady=5, sticky=W)

root.mainloop()

You could also use tkcalendars Calendar:

from tkcalendar import Calendar

e7 = Calendar(root, values="Text", year=2020, state="readonly", date_pattern="yyyy-mm-dd")
e7.grid(row=1, column=1, padx=20, pady=5, sticky=W)

For your case, you can use two of any of these widgets to get (e7.selection_get()) the start date and the end date and then work with it.

Here is the documentation for more information on the widget

Hope it cleared your doubts, if you have errors, do let me know

Cheers

Change date format in Tkinter date picker - python

reference:- Python Tkinter Tk Calendar get custom date not working and unable to display date in format: "DD-MM-YYYY"

You could do something like this:-

from tkinter import *
from tkcalendar import *
root=Tk()
root.geometry("500x500")
def mainF():
    global cal
    def getDate():
        date=cal.get_date()
        print(date)
    cal.pack(pady=20, padx=20)
    butt=Button(root,text="Date Getter", bg="cyan",command=getDate).pack()
cal=Calendar(root,selectmode="day",date_pattern="dd-mm-y")
but=Button(root,text="Pick Date",command=mainF).pack()
root.mainloop()

this is a small date picker app, that changes the format to dd-mm-yy instead of mm-dd-yy, you can implement format change in your code like this

Select date range with Tkinter

You can create two calendars and then choose two dates and then find the range between those two dates. The core function would be:

def date_range(start,stop): # Start and stop dates for range
    dates = [] # Empty list to return at the end
    diff = (stop-start).days # Get the number of days between
    
    for i in range(diff+1): # Loop through the number of days(+1 to include the intervals too)
        day = first + timedelta(days=i) # Days in between
        dates.append(day) # Add to the list
    
    if dates: # If dates is not an empty list
        return dates # Return it 
    else:
        print('Make sure the end date is later than start date') # Print a warning

Now to put things in tkinter perspective, button callbacks cannot return anything, so this should be something like:

from tkinter import *
import tkcalendar
from datetime import timedelta

root = Tk()

def date_range(start,stop):
    global dates # If you want to use this outside of functions
     
    dates = []
    diff = (stop-start).days
    for i in range(diff+1):
        day = start + timedelta(days=i)
        dates.append(day)
    if dates:
        print(dates) # Print it, or even make it global to access it outside this
    else:
        print('Make sure the end date is later than start date')

date1 = tkcalendar.DateEntry(root)
date1.pack(padx=10,pady=10)

date2 = tkcalendar.DateEntry(root)
date2.pack(padx=10,pady=10)

Button(root,text='Find range',command=lambda: date_range(date1.get_date(),date2.get_date())).pack() 

root.mainloop()

Keep in mind, the list is full of datetime objects, to make a list full strings of date alone, say:

dates = [x.strftime('%Y-%m-%d') for x in dates] # In the format yyyy-mm-dd

Python Tkinter Tk Calendar get custom date not working and unable to display date in format: "DD-MM-YYYY"

First of all, in

 getdat=Button(calFrame,text="Get This Date",bg="#00ffde", command=getCustomDate())

you are executing the function instead of passing it as an argument, like in Why is the command bound to a Button or event executed when declared?.

Then, according to the docstring of Calendar, it takes a date_pattern option

date_pattern : str
    date pattern used to format the date as a string. The default
    pattern used is babel's short date format in the Calendar's locale.

    A valid pattern is a combination of 'y', 'm' and 'd' separated by
    non letter characters to indicate how and in which order the
    year, month and day should be displayed.

        y: 'yy' for the last two digits of the year, any other number of 'y's for
           the full year with an extra padding of zero if it has less
           digits than the number of 'y's.
        m: 'm' for the month number without padding, 'mm' for a
           two-digit month
        d: 'd' for the day of month number without padding, 'dd' for a
           two-digit day

    Examples for datetime.date(2019, 7, 1):

        'y-mm-dd' → '2019-07-01'
        'm/d/yy' → '7/1/19'

So just pass date_pattern="dd-mm-yyyy" in argument when creating the Calendar.

Here is an example

from tkinter import Tk, Button
from tkcalendar import Calendar

def getCustomDate():
    print(cal.get_date())

root = Tk()

cal = Calendar(root,
               selectmode="day",
               firstweekday="monday",
               background="#0f8bff",
               foreground="black",
               disabledforeground="#a3bec7",
               bordercolor="grey",
               normalbackground="#d0f4ff",
               weekendbackground="#8ffeff",
               weekendforeground ="black",
               disabledbackground="99b3bc",
               date_pattern="dd-mm-yyyy")
cal.pack(pady=10)
getdat=Button(root, text="Get This Date",
              bg="#00ffde", command=getCustomDate)
getdat.pack()
root.mainloop()

How can we restrict future date selection from tkCalender Date Entry picker in Python?

You can use the set_date method from DateEntry combined with root.after() to control the user input.

import tkinter as tk
from tkcalendar import DateEntry
from datetime import datetime
from tkinter import messagebox

root = tk.Tk()
time_now = datetime.now()
calendar = DateEntry(root, width=12, background='darkblue',foreground='white', borderwidth=2)
calendar.pack()

def date_check():
    calendar_date = datetime.strptime(calendar.get(),"%m/%d/%y")
    if calendar_date > time_now:
        messagebox.showerror("Error", "Selected date must not exceed current date")
        calendar.set_date(time_now)
    root.after(100,date_check)

root.after(100,date_check)

root.mainloop()

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