In JavaScript - ECMAScript 2021, time can be manipulated and retrieved using the built-in Date object.
Here are some examples of how to use time in JavaScript - ECMAScript 2021:
**1. Creating a new date object:**
You can create a new date object in JavaScript using the Date() constructor. If no arguments are passed, it gives the current date and time.
const currentDate = new Date();
console.log(currentDate);
Output:
Sat Oct 16 2021 16:08:26 GMT+0530 (India Standard Time)
**2. Formatting date:**
The Date object has various methods to get different parts of the date and time, such as getFullYear(), getMonth(), getDate(), getHours(), getMinutes(), getSeconds(), and getMilliseconds().
const currentDate = new Date();
console.log(currentDate.getFullYear()); // 2021
console.log(currentDate.getMonth()); // 9 (October, zero-based index)
console.log(currentDate.getDate()); // 16
console.log(currentDate.getHours()); // 16
console.log(currentDate.getMinutes()); // 13
console.log(currentDate.getSeconds()); // 54
console.log(currentDate.getMilliseconds()); // 907
**3. Parsing date and time:**
You can also parse a date and time string and create a Date object using the Date.parse() method.
const timestamp = Date.parse("2021-10-16T16:30:00");
console.log(new Date(timestamp));
Output:
Sat Oct 16 2021 16:30:00 GMT+0530 (India Standard Time)
**4. Timezone manipulation**
You can also get the timezone offset of the user's computer using the getTimezoneOffset() method of the Date object. This method returns the difference between UTC and the local time zone, in minutes.
const currentDate = new Date();
console.log(currentDate.getTimezoneOffset()); // -330 (India Standard Time)
**5. Time differences**
You can calculate the difference between two dates in JavaScript using the getTime() method. This method returns the number of milliseconds since January 1, 1970, 00:00:00 UTC.
const date1 = new Date("2021-10-16T16:00:00");
const date2 = new Date("2021-10-16T16:30:00");
const difference = date2.getTime() - date1.getTime(); // returns difference in milliseconds
console.log(difference / 60000); // 30 (divide by 60000 to get difference in minutes)
These are some of the examples of how to use time in JavaScript - ECMAScript 2021.