from tkinter import * import time root = Tk() timeone = '' clock = Label(root, font=('Tahoma', 48), text='') clock.pack(fill=BOTH, expand=1) def tick(): global timeone timetwo = time.strftime('%H:%M:%S') if timetwo != timeone: timeone = timetwo clock.config(text=timetwo) clock.after(200, tick) tick() root.mainloop()