[Python] How do I change timezone?

I've done a clock in Python, but I have an one problem. The timezone is set on UTC but I want to change it to time in Warsaw. Can you help me?

from tkinter import *
from time import *


def update():


time_string = strftime("%H:%M:%S")
time_label.config(text=time_string)

day_string = strftime("%A")
day_label.config(text=day_string)

date_string = strftime("%B %d, %Y")
date_label.config(text=date_string)

window.after(1000,update)

window = Tk()

time_label = Label(window,font=("Arial",50),fg="#0000ff",bg="white")
time_label.pack()

day_label = Label(window,font=("Comic sans",25,"bold"))
day_label.pack()

date_label = Label(window,font=("Comic Sans MS",30))
date_label.pack()

update()

window.mainloop()




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