check if day is birthday in javascript

To check if the current day is someone's birthday in JavaScript, you can use the built-in Date object to get today's date, create a new Date object with the person's birthdate, and then compare them to see if they are the same.

Here's an example code block that checks if today is someone's birthday:

index.tsx
// Get today's date
const today = new Date();

// Create a new date object with the person's birthdate
const birthdate = new Date('1990-01-01');

// Compare the month and day of today's date and the birthdate
if (today.getMonth() === birthdate.getMonth() && today.getDate() === birthdate.getDate()) {
  console.log("It's their birthday!");
} else {
  console.log("Sorry, today is not their birthday.");
}
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In this example, we're checking if the current month and day (getMonth() and getDate()) of today's date match the birthdate passed to the Date object. If they do match, we log a message saying it's their birthday. If they don't match, we log a message saying it's not their birthday.