Chronos

Chronos is a powerful and user-friendly JavaScript library for working with dates and times. It provides an intuitive API for parsing, manipulating, and formatting dates, making it easier to handle complex date-related operations in your projects.

Getting Started

To use Chronos in your project, include the chronos.min.js file in your HTML:

<script src="path/to/chronos.min.js"></script>

Creating a Chronos Object

You can create a new Chronos object in several ways:

// Current date and time
const now = new Chronos();

// From a date string
const date = new Chronos('2023-05-15T12:00:00Z');

// From a timestamp (milliseconds since epoch)
const timestamp = new Chronos(1684152000000);

// With a specific timezone
const tokyoDate = new Chronos('2023-05-15T12:00:00Z', 'Asia/Tokyo');

Core Methods

Getter Methods

These methods return specific parts of the date:

• year(): Returns the year (e.g., 2023)
• month(): Returns the month (1-12)
• date(): Returns the day of the month (1-31)
• day(): Returns the day of the week (0-6, where 0 is Sunday)
• hours(): Returns the hour (0-23)
• minutes(): Returns the minutes (0-59)
• seconds(): Returns the seconds (0-59)
• milliseconds(): Returns the milliseconds (0-999)
• timestamp(): Returns the Unix timestamp (seconds since epoch)

Example:

const date = new Chronos('2023-05-15T12:30:45Z');
console.log(date.year());  // 2023
console.log(date.month()); // 5
console.log(date.date());  // 15

Manipulation Methods

These methods allow you to modify the date:

• add(value, unit): Adds a specified amount of time
• subtract(value, unit): Subtracts a specified amount of time

Units can be: 'years', 'months', 'weeks', 'days', 'hours', 'minutes', 'seconds'

Example:

const date = new Chronos('2023-05-15T12:00:00Z');
console.log(date.add(1, 'day').format('YYYY-MM-DD')); // 2023-05-16
console.log(date.subtract(2, 'hours').format('YYYY-MM-DD HH:mm')); // 2023-05-15 10:00

Formatting Methods

• format(formatString): Formats the date according to the specified format string
• translatedFormat(formatString, translations): Formats the date with translated month and day names

Format tokens:

• YYYY: 4-digit year
• MM: 2-digit month
• DD: 2-digit day of month
• HH: 2-digit hour (24-hour format)
• mm: 2-digit minutes
• ss: 2-digit seconds

Example:

const date = new Chronos('2023-05-15T12:30:45Z');
console.log(date.format('YYYY-MM-DD HH:mm:ss')); // 2023-05-15 12:30:45

Comparison Methods

These methods allow you to compare dates:

• isBefore(other): Checks if the date is before another date
• isAfter(other): Checks if the date is after another date
• isSame(other): Checks if the date is the same as another date
• isBetween(start, end): Checks if the date is between two other dates
• isSameDay(other): Checks if the date is on the same day as another date
• isSameMonth(other): Checks if the date is in the same month as another date
• isSameYear(other): Checks if the date is in the same year as another date

Example:

const date1 = new Chronos('2023-05-15T12:00:00Z');
const date2 = new Chronos('2023-05-16T12:00:00Z');
console.log(date1.isBefore(date2)); // true
console.log(date1.isSameDay(date2)); // false

Utility Methods

These methods provide additional information about the date:

• isWeekday(): Checks if the date is a weekday (Monday-Friday)
• isWeekend(): Checks if the date is a weekend (Saturday or Sunday)
• isToday(): Checks if the date is today
• isTomorrow(): Checks if the date is tomorrow
• isYesterday(): Checks if the date is yesterday
• isFuture(): Checks if the date is in the future
• isPast(): Checks if the date is in the past
• isLeapYear(): Checks if the year is a leap year
• quarter(): Returns the quarter of the year (1-4)

Example:

const date = new Chronos('2023-05-15T12:00:00Z');
console.log(date.isWeekday()); // true
console.log(date.isLeapYear()); // false

Conversion Methods

These methods convert the Chronos object to other formats:

• toDate(): Converts to a JavaScript Date object
• valueOf(): Returns the timestamp in milliseconds
• toString(): Returns the date as an ISO string
• toJSON(): Returns the date in JSON format
• toArray(): Returns the date components as an array
• toObject(): Returns the date components as an object

Example:

const date = new Chronos('2023-05-15T12:00:00Z');
console.log(date.toArray()); // [2023, 5, 15, 12, 0, 0, 0]
console.log(date.toObject()); // { year: 2023, month: 5, day: 15, ... }

Advanced Methods

• diffForHumans(other, options): Returns a human-readable difference between dates
• duration(other): Calculates the duration between two dates
• addBusinessDays(days): Adds a number of business days to the date
• startOf(unit): Returns the start of a unit of time (year, month, day, hour)
• endOf(unit): Returns the end of a unit of time (year, month, day, hour)

Example:

const date1 = new Chronos('2023-05-15T12:00:00Z');
const date2 = new Chronos('2023-05-20T12:00:00Z');
console.log(date1.diffForHumans(date2)); // 5 days ago
console.log(date1.duration(date2)); // { days: 5, hours: 0, minutes: 0, seconds: 0 }

Static Methods

These methods are called on the Chronos class itself:

• Chronos.now(timezone): Returns a Chronos object for the current date and time
• Chronos.parse(input, timezone): Parses a date string or timestamp
• Chronos.createFromFormat(format, dateString): Creates a Chronos object from a specific date format
• Chronos.createFromTimestamp(timestamp): Creates a Chronos object from a Unix timestamp
• Chronos.createFromTimestampMs(timestampMs): Creates a Chronos object from a timestamp in milliseconds
• Chronos.generateCalendar(year, month): Generates a calendar array for a given year and month

Example:

const now = Chronos.now();
const parsed = Chronos.parse('2023-05-15T12:00:00Z');
const calendar = Chronos.generateCalendar(2023, 5);

Contributing

We welcome contributions to Chronos! If you have any suggestions or improvements, please feel free to submit a pull request.