Time Range Utils

A comprehensive TypeScript library for working with time ranges and date intervals.

Features

• ✅ Merge overlapping ranges - Combine overlapping time periods
• ✅ Subtract ranges - Remove time periods from ranges
• ✅ Split ranges - Divide ranges into equal chunks
• ✅ Check overlaps - Detect if ranges overlap
• ✅ Point-in-range testing - Check if dates fall within ranges
• ✅ Format ranges - Human-readable string representations
• ✅ TypeScript support - Full type safety and IntelliSense
• ✅ Comprehensive validation - Detailed error messages for invalid inputs
• ✅ Zero dependencies - Lightweight and fast

Installation

npm install time-range-utils
# or
yarn add time-range-utils
# or
pnpm add time-range-utils

Quick Start

import TimeRangeUtils from "time-range-utils";

const ranges = [
  {
    start: new Date("2025-01-01T10:00:00Z"),
    end: new Date("2025-01-01T12:00:00Z"),
  },
  {
    start: new Date("2025-01-01T11:00:00Z"),
    end: new Date("2025-01-01T13:00:00Z"),
  },
];

// Merge overlapping ranges
const merged = TimeRangeUtils.mergeOverlap(ranges);
// Result: [{ start: 2025-01-01T10:00:00Z, end: 2025-01-01T13:00:00Z }]

// Split a range into chunks
const range = {
  start: new Date("2025-01-01T10:00:00Z"),
  end: new Date("2025-01-01T12:00:00Z"),
};
const chunks = TimeRangeUtils.splitRange(range, 4);
// Result: 4 equal 30-minute periods

// Check if date is within range
const isInside = TimeRangeUtils.isInside(
  new Date("2025-01-01T11:00:00Z"),
  range
);
// Result: true

API Reference

mergeOverlap(ranges: DateRange[]): DateRange[]

Merges overlapping or adjacent time ranges.

subtractRanges(rangeA: DateRange, rangeB: DateRange): DateRange[]

Subtracts rangeB from rangeA, returning remaining time periods.

splitRange(range: DateRange, chunks: number): DateRange[]

Splits a time range into equal chunks.

isOverlap(rangeA: DateRange, rangeB: DateRange): boolean

Checks if two ranges overlap (inclusive boundaries).

isInside(date: Date, range: DateRange): boolean

Tests if a date falls within a range (inclusive boundaries).

formatRange(range: DateRange): string

Converts a range to a human-readable string.

Error Handling

The library provides detailed error types for better debugging:

import { InvalidDateRangeError, InvalidParameterError } from "time-range-utils";

try {
  TimeRangeUtils.splitRange(range, -1);
} catch (error) {
  if (error instanceof InvalidParameterError) {
    console.log(`Invalid parameter: ${error.parameterName}`);
    console.log(`Value: ${error.parameterValue}`);
  }
}

TypeScript Support

Full TypeScript definitions included:

type DateRange = {
  start: Date;
  end: Date;
};

Contributing

1. Fork the repository
2. Create a feature branch: git checkout -b feature/amazing-feature
3. Make your changes and add tests
4. Run tests: pnpm test
5. Run linting: pnpm run lint
6. Commit your changes: git commit -m 'Add amazing feature'
7. Push to the branch: git push origin feature/amazing-feature
8. Open a Pull Request

Development

# Install dependencies
pnpm install

# Run tests
pnpm test

# Run tests with coverage
pnpm run test:coverage

# Run linting
pnpm run lint

# Build the package
pnpm run build

# Type checking
pnpm run type-check

License

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

Changelog

See CHANGELOG.md for a detailed history of changes.

Support

• 📖 Documentation
• 🐛 Issue Tracker
• 💬 Discussions