AlarmClock

import telebot
from datetime import *
from threading import Thread

bot = telebot.TeleBot("819452497:AAEyEtgrW50WLM9sR1Kp37VeICQGNBFQRhY")

alc = {}

@bot.message_handler(content_types=["text"])
def check(mes):
    id = mes.chat.id
    text = mes.text
    if text == "/start":
        bot.send_message(id, "Welcome.\nTo set a new alarm clock, text a command in a following manner:\nset HH:MM:SS\nTo erase the alarm clock, text \"clear\".")
        alc[id] = 999999
    else:
        spl = text.split(' ')
        if spl[0] == "set":
            h = int(spl[1].split(':')[0])
            m = int(spl[1].split(':')[1])
            s = int(spl[1].split(':')[2])
            alc[id] = h*3600 + m*60 + s
            bot.send_message(id, "Alarm clock set.")
        elif text == "clear":
            alc[id] = 999999
            bot.send_message(id, "Alarm clock deleted.")


def checkTime():
    while True:
        hms = datetime.now().strftime("%H %M %S").split(' ')
        currtime = int(hms[0]) * 3600 + int(hms[1]) * 60 + int(hms[2])
        for k in alc.keys():
            if currtime >= alc[k]:
                alc[k] += 10
                bot.send_message(k, "ALARM!!! ALARM!!! (text \"clear\" to stop the alarm)")


timeThread = Thread(target = checkTime)
timeThread.start()

bot.polling(none_stop=True)