# DateParserJS

A lightweight natural language date parser that interprets and parses common date expressions, such as:

- `"today"`
- `"tomorrow"`
- `"yesterday"`
- `"3 days from now"`
- `"next Monday"`
- `"end of the month"`

## Features

- **Simple parsing** for common relative dates like "today," "tomorrow," and "yesterday."
- **Support for advanced relative dates**, like `"3 days from now"`, `"next Monday"`, `"1 week ago"`, and more.
- **Weekday parsing** for phrases like `"next Monday"`, `"last Tuesday"`, and other variations.
- **Advanced parsing with Chrono-node**, allowing for flexible and complex date expressions.
- **Special handling** for relative periods like `"next month"`, `"start of the week"`, `"end of the quarter"`, and more.

## Installation

To get started with `DateParserJS`, you need to install the package via npm:

```bash
npm install dateparserjs

Usage

Simple Date Parser (Using simple.js)

The simple parser can handle basic relative dates, such as "today," "tomorrow," and "yesterday."

const DateParserJS = require('dateparserjs/src/simple');

const parser = new DateParserJS();
console.log(parser.parse("today"));           // Returns today's date
console.log(parser.parse("tomorrow"));       // Returns tomorrow's date
console.log(parser.parse("yesterday"));      // Returns yesterday's date
console.log(parser.parse("3 days from now"));// Returns date 3 days from now
console.log(parser.parse("next Monday"));    // Returns next Monday's date

Advanced Date Parser (Using advanced.js)

The advanced parser can handle more complex expressions like relative dates ("3 weeks ago") and specific periods ("next month", "start of the year").

const AdvancedDateParserJS = require('dateparserjs/src/advanced');

const parser = new AdvancedDateParserJS();
console.log(parser.parse("today"));           // Returns today's date
console.log(parser.parse("tomorrow"));       // Returns tomorrow's date
console.log(parser.parse("1 week ago"));     // Returns date 1 week ago
console.log(parser.parse("next month"));     // Returns the start of next month
console.log(parser.parse("end of the week"));// Returns end of the current week

Example Script

You can run an example script to see both parsers in action. In the examples/ folder, there is a file called basic.js which demonstrates the usage of the parsers.

// examples/basic.js
const SimpleDateParserJS = require('dateparserjs/src/simple');
const AdvancedDateParserJS = require('dateparserjs/src/advanced');

const simpleParser = new SimpleDateParserJS();
const advancedParser = new AdvancedDateParserJS();

console.log("Simple Parser:");
console.log("Today:", simpleParser.parse("today"));
console.log("Tomorrow:", simpleParser.parse("tomorrow"));
console.log("Yesterday:", simpleParser.parse("yesterday"));
console.log("Next Monday:", simpleParser.parse("next Monday"));
console.log("3 days from now:", simpleParser.parse("3 days from now"));

console.log("\nAdvanced Parser:");
console.log("Today:", advancedParser.parse("today"));
console.log("Tomorrow:", advancedParser.parse("tomorrow"));
console.log("1 week ago:", advancedParser.parse("1 week ago"));
console.log("Next month:", advancedParser.parse("next month"));
console.log("End of the week:", advancedParser.parse("end of the week"));

To run the example script, execute:

node examples/basic.js

Testing

The project uses Jest for testing. To run the tests, you can execute the following command:

npm test

Example Tests

You can find the test file in the test/ folder as dateparser.test.js. Jest tests include checks for various date expressions and their expected outputs.

License

This project is licensed under the MIT License - see the LICENSE.md file for details.

Contributing

Contributions are welcome! Feel free to fork the repository and submit a pull request.