3day_timer_and_elapsed_timer.py

import tkinter as tk
from tkinter import ttk
import time

class CountdownTimer:
    def __init__(self, master):
        self.master = master
        self.master.title("Optimized Countdown + Elapsed Timer")

        # UI layout
        ttk.Label(master, text="3-Day Countdown Timer:", font=("Arial", 12)).grid(row=0, column=0, sticky='w')
        self.label_3day = ttk.Label(master, text="", font=("Consolas", 14))
        self.label_3day.grid(row=0, column=1, sticky='w')

        ttk.Label(master, text="Elapsed Timer (since start):", font=("Arial", 12)).grid(row=1, column=0, sticky='w')
        self.label_custom = ttk.Label(master, text="00:00:00", font=("Consolas", 14))
        self.label_custom.grid(row=1, column=1, sticky='w')

        # Buttons
        ttk.Button(master, text="Start", command=self.start).grid(row=2, column=0, pady=10)
        ttk.Button(master, text="Stop", command=self.stop).grid(row=2, column=1, pady=10)

        # Timer state
        self.running = False
        self.start_time_3day = None
        self.end_time_3day = None
        self.start_time_custom = None

    def start(self):
        if not self.running:
            self.running = True
            now = time.perf_counter()

            self.start_time_3day = now
            self.end_time_3day = now + (3 * 24 * 3600)  # 3 days countdown

            self.start_time_custom = now  # custom timer is elapsed since start
            self.update_loop()

    def stop(self):
        self.running = False

    def update_loop(self):
        if not self.running:
            return

        now = time.perf_counter()

        # 3-Day Countdown Timer
        remaining = max(0, int(self.end_time_3day - now))
        d, rem = divmod(remaining, 86400)
        h, rem = divmod(rem, 3600)
        m, s = divmod(rem, 60)
        self.label_3day.config(text=f"{d}d {h:02}:{m:02}:{s:02}")

        # Elapsed Custom Timer
        elapsed = max(0, int(now - self.start_time_custom))
        eh, rem = divmod(elapsed, 3600)
        em, es = divmod(rem, 60)
        self.label_custom.config(text=f"{eh:02}:{em:02}:{es:02}")

        self.master.after(250, self.update_loop)  # Smooth update

if __name__ == "__main__":
    root = tk.Tk()
    CountdownTimer(root)
    root.mainloop()