import datetime
import time
point_time = datetime.datetime.now()
p_hour = point_time.hour
p_minute = point_time.minute
p_second = point_time.second
ts=p_second+p_minute*60+p_hour*60*60
def timer(se, mt=0,ht=0):
    now_time = datetime.datetime.now()
    now_hour = now_time.hour
    now_minute = now_time.minute
    now_second = now_time.second
    tn=now_hour*60*60+now_minute*60+now_second+50+365+3600+3600 #цифры добавленны для теста таймера
    dt=tn-se
    print (dt)
    if dt>59:
        st=dt-(dt//60)*60
        mt=mt+dt//60
        print (mt)
    if mt>59:
        ht=ht+mt//60
        mt=mt-(mt//60)*60
        print(ht ,mt,st)
        
i=100  #время в секундах сколько отсчитать
while i>0:
    i=i-1
    time.sleep(1)
    timer(ts)

import datetime
from threading import Timer
 
def tick(started=None):
    Timer(1.0, tick, args=(started,)).start()
    elapsed = datetime.datetime.now() - started
    print str(elapsed)
 
tick(datetime.datetime.now())

from tkinter import *
root=Tk()
x=0
def la(x):
    x=x+1
    lab['text'] = x
    lab.after(1000, la(x))
lab=Label(root, text=x)
lab.pack()
lab.after(500, la(x))
root.mainloop()