Eonix

A modern JavaScript date manipulation library that extends the native Date class with powerful utility methods for date calculations, timezone conversions, and difference calculations.

Features

• Extends native Date class with additional functionality
• Comprehensive date difference calculations
• Timezone conversion utilities
• Leap year handling
• Week and day calculations
• Date arithmetic operations
• Full TypeScript support

Installation

npm install eonix

Usage

import Eonix from "eonix";

// Create a new Eonix instance
const date = new Eonix("2023-01-01");

// Add time to a date
date.add({ years: 1, months: 2, days: 3 });
console.log(date); // 2024-03-04

// Calculate difference between dates
const diff = Eonix.diff("2023-01-01", "2023-06-30");
console.log(diff.inMonths()); // 5
console.log(diff.inDays()); // 180

// Sort dates
const [earlier, later] = Eonix.sort("2023-06-30", "2023-01-01");

API Documentation

Static Methods

Eonix.sort(...dates)

Creates a sorted array of Eonix instances based on the given dates.

const [date1, date2] = Eonix.sort("2023-01-01", "2023-06-30");

Eonix.diff(start, end)

Calculates the difference between two dates.

const diff = Eonix.diff("2023-01-01", "2023-06-30");

Instance Methods

Date Arithmetic

• add({ years, months, weeks, days, hours, minutes, seconds, milliseconds })
• addDate({ years, months, weeks, days })
• addTime({ hours, minutes, seconds, milliseconds })
• addYears(years)
• addMonths(months)
• addWeeks(weeks)
• addDays(days)
• addHours(hours)
• addMinutes(minutes)
• addSeconds(seconds)
• addMilliseconds(milliseconds)

Date Information

• getWeekday() - Returns day of week (1-7)
• getDayOfYear() - Returns day of year
• getWeekNumber() - Returns week number
• isLeapYear() - Checks if date is in a leap year
• isUTC() - Checks if date is in UTC
• inRange() - Checks if date is in date range

Timezone Operations

• convertToUTC() - Converts date to UTC
• convertToTimeZone(offset) - Converts to specified timezone offset
• toDate() - Converts to native Date object

Diff Class Methods

Generic Difference Calculation

• inUnits(units) - Calculates the difference between two dates in specified units

  const diff = Eonix.diff("2023-01-01", "2023-06-30");
  const result = diff.inUnits(["years", "months", "days"]);
  // Result: { years: 0, months: 5, days: 29 }

  Available units: "years", "months", "weeks", "days", "hours", "minutes", "seconds", "milliseconds" If no units are specified, all units will be calculated.

Difference Calculations

• inYears({ absolute = false })
• inMonths({ absolute = false })
• inWeeks({ absolute = false })
• inDays({ absolute = false })
• inHours({ absolute = false })
• inMinutes({ absolute = false })
• inSeconds({ absolute = false })
• inMilliseconds({ absolute = false })

Examples

Date Arithmetic

const date = new Eonix("2023-01-01");
date.add({ years: 1, months: 2, days: 3 });
// Result: 2024-03-04

Date Differences

const diff = Eonix.diff("2023-01-01", "2023-06-30");
console.log(diff.inMonths()); // 5
console.log(diff.inDays()); // 180

Timezone Conversion

const date = new Eonix("2023-01-01");
date.convertToTimeZone(2); // Convert to UTC+2

Leap Year Handling

const date = new Eonix("2020-02-29");
console.log(date.isLeapYear()); // true

Check if date is in date range

const date = new Eonix('2023-06-15');
const start = new Eonix('2023-06-01');
const end = new Eonix('2023-06-30');
console.log(date.inRange(start, end)); // true

License

MIT

Author

• Roman Nebel
• Email: r@nebel.im
• Website: https://nebel.im