The setDate method in the JavaScript programming language is a user-defined function for changing the day of a specific date. This method allows you to adjust to a specific day of a month. Whenever you need to make changes to an existing date, this method can be very helpful.
For example, assume you have a date and you want to move to the next day or even go back and check some days before. In this situation, the setDate method is a suitable tool that will allow you to change the day easily.
Using this method is very simple; you only need to send the day value to it. If the value exceeds the number of days in the month, it automatically rolls over to the next month, and if it is negative, it moves to the previous month.
Remembering this method can help programmers make changes to different days of dates in their projects, and this can simplify more complex coding tasks for you.
For example, you can connect this method to user interactions, such as dynamically changing dates based on clicked events.
Code Example Using Date.setDate
<script>
let date = new Date();
console.log("Initial date:", date);
date.setDate(date.getDate() + 1);
console.log("Next day's date:", date);
date.setDate(date.getDate() - 3);
console.log("Three days ago:", date);
</script>
Line-by-Line Code Explanation
let date = new Date();
A new date object is created based on the current date and time.
console.log("Initial date:", date);
The initial date created is printed in the console.
date.setDate(date.getDate() + 1);
The date is increased by one day, and it is rolled over to the next day.
console.log("Next day's date:", date);
The new date after the increment of one day is printed in the console.
date.setDate(date.getDate() - 3);
It can decrease the current date by three days and goes back to three days ago.
console.log("Three days ago:", date);
The new date that goes back three days will be printed in the console.