#!/usr/bin/env python

#import sys

#

#if sys.version_info.major == 2:

# import Tkinter as tk

#else:

# import tkinter as

try:

import Tkinter as tk # Python 2.x

except:

import tkinter as tk # Python 3.x

from datetime import datetime, timedelta

# --- constants ---

# empty

# --- classes ---

class Clock(tk.Frame):

def __init__(self, parent, offset_minutes=0):

# create widget (and send all arguments to Frame, ie. parent)

tk.Frame.__init__(self, parent) # Python 2 & 3

#super().__init__() # Python 3 only

self.offset_minutes = timedelta(minutes=offset_minutes)

# create variable for displayed time and use it with Label

self.txt_var = tk.StringVar()

tk.Label(self, textvariable=self.txt_var).pack()

def update(self):

# update displayed time

current_time = datetime.now()

current_time += self.offset_minutes

current_time_str = current_time.strftime('%Y.%m.%d %H:%M:%S')

# current_time_str = datetime.now().strftime('%Y.%m.%d %H:%M:%S')

self.txt_var.set(current_time_str)

# update again after 1000ms (1s)

self.after(1000, self.update)

# ---

class App(tk.Tk):

def __init__(self):

tk.Tk.__init__(self)

self.title('World Times')

tk.Label(self, text="-120min.:").grid(row=0, column=0, sticky=tk.E)

tk.Label(self, text="Local:").grid(row=1, column=0, sticky=tk.E)

tk.Label(self, text="+120min.:").grid(row=2, column=0, sticky=tk.E)

self.clock_1 = Clock(self, -120)

self.clock_1.grid(row=0, column=1)

self.clock_2 = Clock(self)

self.clock_2.grid(row=1, column=1)

self.clock_3 = Clock(self, 120)

self.clock_3.grid(row=2, column=1)

def run(self):

# update first time

self.clock_1.update()

self.clock_2.update()

self.clock_3.update()

# start the engine :)

self.mainloop()

# --- functions ---

# empty

# --- main ---

App().run()