[Tkinter] How to adjust time - tkinter

[Ondrej]

Hello everbody,

please help me to solve one issue with my tkinter clock. Time is imported from my cpu but sometimes I need to shift few seconds down or up, so I created buttons with command functions, the problem is that i don´t know how to set the def or those buttons properly (with print function, or transfor string to int and back?), Thanks for any advice. Bellow you can see code:

import sys, random
from tkinter import *
from tkinter import ttk

import time

 
def tick():
    time_string=time.strftime('%H:%M:%S')
    clock.config(text=time_string)
    clock.after(200,tick)
    
root=Tk()

def callback():
    time_string=time.strftime(chr('%H:%M:%S'))

button1=ttk.Button(root, text="Add a second", command=callback)

def call():
    print("down")
button2=ttk.Button(root, text="Remove a sec", command=call)
clock=Label(root, font=("times", 120, "bold"), bg="green")
button1.grid(row=1, column=1)
button2.grid(row=2, column=1)
clock.grid(row=0, column=1)
tick()
root.mainloop()

[Larz60+]

see: https://pymotw.com/3/datetime/

[Yoriz]

import datetime
import tkinter as tk
from tkinter import ttk


class MainFrame(tk.Frame):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.clock_offset = 0
        self.create_widgets()
        self.layout_widgets()
        self.tick()

    def create_widgets(self):
        self.clock = tk.Label(self.master, font=(
            "times", 120, "bold"), bg="green")
        self.button1 = ttk.Button(
            self.master, text="Add a second", command=self.on_add)
        self.button2 = ttk.Button(
            self.master, text="Remove a sec", command=self.on_remove)

    def layout_widgets(self):
        self.clock.grid(row=0, column=1)
        self.button1.grid(row=1, column=1)
        self.button2.grid(row=2, column=1)

    def tick(self):
        datetime_now = datetime.datetime.now()
        datetime_offset = datetime_now + datetime.timedelta(seconds=self.clock_offset)
        time_string = datetime_offset.strftime('%H:%M:%S')
        self.clock.config(text=time_string)
        self.after(1000, self.tick)

    def on_add(self):
        self.clock_offset += 1

    def on_remove(self):
        self.clock_offset -= 1


root = tk.Tk()
MainFrame(None)
root.mainloop()