MiniDayjs

MiniDayjs is a lightweight JavaScript library for date manipulation, inspired by Dayjs. It provides a simple and efficient API to handle common date operations such as formatting, adding, subtracting, and comparing dates, all while keeping the bundle size small.

Installation

You can install MiniDayjs via npm:

npm install mini-dayjs

Alternatively, if you're using Yarn:

yarn add mini-dayjs

Usage

Here's how you can start using MiniDayjs in your project:

Basic Date Creation

You can create a MiniDayjs instance for the current date or a specific date:

const dayjs = require('mini-dayjs');

// Create a new instance for the current date
const now = dayjs();

// Create a new instance for a specific date
const specificDate = dayjs('2025-01-01');

console.log(now.format('YYYY-MM-DD'));  // Output: Current date in "YYYY-MM-DD" format
console.log(specificDate.format('YYYY-MM-DD'));  // Output: 2025-01-01

Date Formatting

You can format dates using the format() method. Here's an example:

const formattedDate = dayjs('2025-01-01').format('MMMM DD, YYYY');
console.log(formattedDate);  // Output: January 01, 2025

Supported Format Tokens

• YYYY– Full year (e.g., 2025)
• YY– Short year (e.g., 25)
• MMMM– Full month name (e.g., January)
• MMM– Abbreviated month name (e.g., Jan)
• DD– Day of the month (e.g., 01)

Adding and Subtracting Time

You can easily add or subtract time (e.g., days, months, years) to/from a date:

const futureDate = dayjs().add(3, 'day');  // Adds 3 days
const pastDate = dayjs().subtract(2, 'month');  // Subtracts 2 months

console.log(futureDate.format('YYYY-MM-DD'));  // Output: 3 days from now
console.log(pastDate.format('YYYY-MM-DD'));  // Output: 2 months ago

Comparing Dates

You can compare dates using isBefore() and isAfter():

const date1 = dayjs('2025-01-01');
const date2 = dayjs('2025-01-02');

console.log(date1.isBefore(date2));  // Output: true
console.log(date1.isAfter(date2));   // Output: false

Time Ago (Relative Time)

You can display the relative time (e.g., "2 days ago") using the fromNow() method:

const pastDate = dayjs('2025-01-01');
console.log(pastDate.fromNow());  // Output: "X days ago" (depends on the current date)

Methods Overview

Here’s a quick overview of the main methods available in MiniDayjs:

• add(amount, unit): Adds a specified amount of time (e.g., days, months, years).
• subtract(amount, unit): Subtracts a specified amount of time.
• format(formatString): Formats the date in a human-readable format.
• isBefore(date): Checks if the current date is before the specified date.
• isAfter(date): Checks if the current date is after the specified date.
• fromNow(): Returns the relative time from the current date (e.g., "2 days ago").
• toDate(): Returns the underlying JavaScript Date object.

Example

Here’s a full example that demonstrates creating a MiniDayjs instance, formatting dates, adding/subtracting time, and comparing dates:

const dayjs = require('mini-dayjs');

// Create a new instance for today
const today = dayjs();

// Create a new instance for New Year's Day 2025
const newYear = dayjs('2025-01-01');

// Add 5 days to the current date
const fiveDaysLater = today.add(5, 'day');
console.log(fiveDaysLater.format('YYYY-MM-DD'));  // Output: 5 days from today

// Subtract 3 months from the current date
const threeMonthsAgo = today.subtract(3, 'month');
console.log(threeMonthsAgo.format('YYYY-MM-DD'));  // Output: 3 months ago

// Compare two dates
console.log(newYear.isBefore(today));  // Output: true (if New Year's Day 2025 is before today)
console.log(newYear.isAfter(today));   // Output: false

// Show relative time from now
console.log(newYear.fromNow());  // Output: "1 year ago" (depends on the current date)