Easy timestamp creation

timestamp.py

import os, keyboard, time, json, threading

def format(elapsed):
    ms = int((elapsed * 1000) % 1000)
    seconds = int(elapsed % 60)
    minutes = int((elapsed // 60) % 60)
    hours = int((elapsed // 3600) % 24)
    return f"{hours:02}:{minutes:02}:{seconds:02}.{ms:03}"

def record():
    elapsed = time.time() - start_time
    timestamp = format(elapsed)
    print(f"\nTimestamp recorded: {timestamp}")
    timestamps.append(timestamp)
    save()

def save():
    with open(FILE_NAME, 'w') as f:
        json.dump(timestamps, f, indent=4)

def display_time():
    while not stop_event.is_set():
        elapsed = time.time() - start_time
        current_time = format(elapsed)
        print(f"\rCurrent Time: {current_time} - Press 'space' to record timestamp, 'esc' to exit.", end='')
        time.sleep(0.01)

if __name__ == "__main__":

    FILE_NAME = 'timestamps.json'
    start_time = time.time()
    timestamps = []

    if os.path.exists(FILE_NAME):
        with open(FILE_NAME, 'r') as f:
            timestamps = json.load(f)

    stop_event = threading.Event()
    keyboard.add_hotkey('space', record)

    display_thread = threading.Thread(target=display_time)
    display_thread.start()

    keyboard.wait('esc')

    stop_event.set()
    display_thread.join()

    save()
    print("\nTimestamps saved.")