# Timer App User Manual

## Introduction
The Timer App is a simple application that accurately measures and displays elapsed time. It provides a user-friendly interface with start, stop, and reset functionality. The app can handle both short durations, such as milliseconds, and longer durations, such as hours or even days. It also offers options for displaying time in various formats, such as hours:minutes:seconds or minutes:seconds:milliseconds. The Timer App is designed to be platform-independent and compatible with popular operating systems like Windows, macOS, and Linux. It runs in the background without affecting other software operations and handles errors gracefully.

## Installation
To use the Timer App, you need to have Python installed on your system. You can download Python from the official website: https://www.python.org/downloads/

Once you have Python installed, follow these steps to install the Timer App:

1. Open a command prompt or terminal.
2. Navigate to the directory where you have saved the Timer App files.
3. Run the following command to install the required dependencies:

```
pip install -r requirements.txt
```

## Usage
To start the Timer App, follow these steps:

1. Open a command prompt or terminal.
2. Navigate to the directory where you have saved the Timer App files.
3. Run the following command:

```
python main.py
```

The Timer App window will open, displaying the current time as "00:00:00" in the default format.

### Start the Timer
To start the timer, click the "Start" button. The timer will begin counting the elapsed time.

### Stop the Timer
To stop the timer, click the "Stop" button. The timer will pause, and the elapsed time will be displayed.

### Reset the Timer
To reset the timer, click the "Reset" button. The timer will be reset to zero, and the elapsed time will be cleared.

### Change Time Format
By default, the Timer App displays time in the format "HH:MM:SS". To change the time format, follow these steps:

1. Click inside the "Time Format" entry field.
2. Enter one of the following format options:
   - "HH:MM:SS" for hours:minutes:seconds format
   - "MM:SS:MS" for minutes:seconds:milliseconds format

### Background Operation
The Timer App is designed to run in the background without affecting other software operations. You can minimize the app window or switch to other applications while the timer is running.

### Error Handling
The Timer App handles errors gracefully and provides appropriate error messages when necessary. If you enter an invalid time format, the app will display an error message.

## Conclusion
The Timer App is a user-friendly and versatile tool for accurately measuring and displaying elapsed time. It provides various time format options, runs in the background, and handles errors gracefully. Whether you need to time short durations or longer durations, the Timer App is a reliable choice.