How to Create a Calendar in HTML Using Javascript?

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Users can view the current date and day in a dynamic calendar. With the previous and next icons, you can also view the days of the present, past, or upcoming month. In this article, I will show you how you can easily create a dynamic calendar for yourself by just using JavaScript in HTML.

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How to create calendar in html using javascript

How to create calendar in html using javascript

To make an HTML calendar with JavaScript, follow these steps:

Step 1: Create the UI

The UI element is straightforward to create. These are the key components that we must develop.

  • Make a table with seven columns titled “Sunday” through “Saturday.”
  • To go across the months, create “previous” and “next” buttons.
  • Make dropdowns so users may quickly access any month or year.

Now we have to create a body for the table, and the table’s cells will be dynamically made and filled.

Step 2: Program writing

The program has a wide range of features. Create a function called showCalendar(month, year) that accepts the two arguments month and year as its initial step. After the function invokes, it dynamically generates HTML calendar and add it to your table.

  • Acquire the month’s first day, then use –
let firstDay = (new Date(year, month)) . GetDay();
  • Next, determine how many days are in that month. The date function can also be used for this. Then use –
daysInMonth(iMonth, iYear)


return 32 — new Date(iYear, iMonth, 32).getDate();


The function new Date(year, month, 32) returns the day that fell on the 32nd of the month. We can find the last day of the month by taking that date from 32. For instance, if we use February 2018 as an example, its “32nd” day will be the Fourth of March; removing 32 from 4 and obtaining 28 leaves us with the 28th day of February 2018.

When the two items get prepared, we fill the table with the numbers 1 through [last day of the month] in the appropriate positions. We’ll place the number 1 below Thursday, the number 2 below Friday, the number 3 below Saturday, and so on if the beginning of that month is Thursday and the ending date is Sunday, 28 is where the loop breaks.

Calendar using javascript

Because there are up to 6 rows and 7 columns, you apply a nested for loop in this situation.

The outer loop creates up to six new “tr” elements or table rows. (the absolute maximum amount of rows required to form the calendar), execute the inner loop to create the items in each row, and then append those rows to our table.

Then insert “td” elements into each row in the inner loop. So, to maintain track of the date, you utilize the variable “date” in it. For each iteration, there are three if conditions:

  1. Create a td element and leave it blank if you are in the first row but still need to move on to the first.
  2. If the “date” is greater than the number of days allowed in that month, you have finished building the table and have thus broken out of the loop.
  3. Create a “td” element and print the “date” in it. Here, you may also verify that the day, month, and year we are now on the match today’s date, and you may choose to highlight it if it does.

Implement now the tools for switching between months. You must create a variable called currentYear and currentMonth; its initial values are the current year and month. When the program launches, the call to showCalendar(currentMonth, currentYear) causes the calendar for the current month to be displayed.

See Also: How To Display Time In HTML Using JavaScript


To update the currentMonth and currentYear values and use the function showCalendar to update the calendar, build the functions previous(), next(), and jump().

After finishing the code portion, you may connect everything and enhance the user interface (UI) with some basic bootstrap.

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