TypeScript - get first day of month

In this article, we would like to show you how to get the first day of the month in TypeScript.

Quick solution:

const date: Date = new Date('Mon Aug 02 2021');
const firstDay: Date = new Date(date.getFullYear(), date.getMonth(), 1);

console.log(firstDay); // 2021-07-31T22:00:00.000Z

Practical example

In this example, we use:

• date.getFullYear() - to get the year of the specified date,
• date.getMonth() - to get the month of the specified date,
• 1 in the Date() constructor stands for the day of the month.

const date: Date = new Date('Mon Aug 02 2021');
const firstDay: Date = new Date(date.getFullYear(), date.getMonth(), 1);

console.log(firstDay); // 2021-07-31T22:00:00.000Z

Output:

2021-07-31T22:00:00.000Z