Mastering Date Manipulation in JavaScript Using Day.js
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Chapter 1: Introduction to Day.js
Day.js is a powerful JavaScript library designed for effortless date manipulation within applications.
In this guide, we will explore how to utilize Day.js for various date-related operations in JavaScript.
Section 1.1: Getting the Day of the Year
To determine the day of the year using Day.js, you can employ the dayOfYear method from the dayOfYear plugin:
const dayjs = require("dayjs");
const dayOfYear = require("dayjs/plugin/dayOfYear");
dayjs.extend(dayOfYear);
const result = dayjs().dayOfYear();
console.log(result);
Here, we import the dayOfYear plugin with the following line:
const dayOfYear = require("dayjs/plugin/dayOfYear");
Section 1.2: Retrieving the Week of the Year
To find out the week number of the year, you can use the week method from the weekOfYear plugin:
const dayjs = require("dayjs");
const weekOfYear = require("dayjs/plugin/weekOfYear");
dayjs.extend(weekOfYear);
const result = dayjs().week();
console.log(result);
You can include the weekOfYear plugin like this:
const weekOfYear = require("dayjs/plugin/weekOfYear");
Subsection 1.2.1: ISO Week of the Year
To get the ISO week number of the year, use the isoWeek method from the isoWeek plugin:
const dayjs = require("dayjs");
const isoWeek = require("dayjs/plugin/isoWeek");
dayjs.extend(isoWeek);
const result = dayjs().isoWeek();
console.log(result);
We include the isoWeek plugin as follows:
const isoWeek = require("dayjs/plugin/isoWeek");
Section 1.3: Extracting the Month
To retrieve the current month from a Day.js date, the month method can be utilized:
const dayjs = require("dayjs");
const result = dayjs().month();
console.log(result);
Section 1.4: Finding the Quarter of the Year
To identify the quarter of the year, you can use the quarter method from the quarterOfYear plugin:
const dayjs = require("dayjs");
const quarterOfYear = require("dayjs/plugin/quarterOfYear");
dayjs.extend(quarterOfYear);
const result = dayjs().quarter();
console.log(result);
We import the quarterOfYear plugin like this:
const quarterOfYear = require("dayjs/plugin/quarterOfYear");
Section 1.5: Getting the Current Year
To obtain the current year, the year method can be employed:
const dayjs = require("dayjs");
const result = dayjs().year();
console.log(result);
Section 1.6: Total Weeks in a Year
To calculate the total number of weeks in a year, you may use the isoWeeksInYear method available with both the isoWeeksInYear and isLeapYear plugins:
const dayjs = require("dayjs");
const isoWeeksInYear = require("dayjs/plugin/isoWeeksInYear");
const isLeapYear = require("dayjs/plugin/isLeapYear");
dayjs.extend(isoWeeksInYear);
dayjs.extend(isLeapYear);
const result = dayjs().isoWeeksInYear();
console.log(result);
We import the necessary plugins as shown:
const isoWeeksInYear = require("dayjs/plugin/isoWeeksInYear");
const isLeapYear = require("dayjs/plugin/isLeapYear");
Conclusion
In summary, Day.js is a robust library that simplifies date manipulation in JavaScript applications.
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Chapter 2: Video Tutorials
Learn more about date manipulation techniques in JavaScript through the following tutorials.
The first video, titled "How To Format Dates in Javascript with DAY.JS," provides a comprehensive overview of date formatting using the Day.js library.
The second video, "How to Display Dates and Times in JavaScript - Beginner's Tutorial," is a great resource for beginners looking to understand date and time representation in JavaScript.