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Article about how to find day from date and year:
Find the day, week, month, or quarter of the year using JavaScript. JavaScript's Date API lacks a lot of methods for working with dates, which is why third-party date libraries are so popular. However, operations such as finding the day, week, month, or quarter of the year that a date corresponds to can be easily implemented without the use of libraries.



You may not be familiar with JavaScript's numeric separators, which are used in the examples below. They're syntactic sugar that make large numeric values more readable. Day of year. Finding the day of the year (in the range 1-366 ) from a Date object is fairly straightforward. We can use the Date constructor and Date.prototype.getFullYear() to get the first day of the year as a Date object. Then, we can subtract the first day of the year from the given date and divide with the milliseconds in each day to get the result. Finally, we can use Math.floor() to appropriately round the resulting day count to an integer. Week of year. Calculating the week of the year also starts by calculating the first day of the year as a Date object. We can then use Date.prototype.setDate() , Date.prototype.getDate() and Date.prototype.getDay() along with the modulo ( % ) operator to get the first Monday of the year. Finally, we can subtract the first Monday of the year from the given date and divide with the number of milliseconds in a week. We can use Math.round() to get the zero-indexed week of the year corresponding to the given date . Negative zero ( -0 ) is returned if the given date is before the first Monday of the year. Month of year. Finding the month of the year (in the range 1-12 ) from a Date object is the most straightforward of the bunch. Simply use Date.prototype.getMonth() to get the current month in the range 0-11 and add 1 to map it to the range 1-12 . Quarter of year. Finding the quarter of the year (in the range 1-4 ) from a Date is quite simple, too. After retrieving the current month, we can use Math.ceil() and divide the month by 3 to get the current quarter. Last updated: January 5, 2024 · View On GitHub. More like this. Find the number of days in a month using JavaScript. Calculate the number of days in a month for a given year using JavaScript. How can I find the date of n days ago from today using JavaScript? Calculate the date of n days ago from today or the date of n days from now. Get the first or last date of a month using JavaScript. Use the Date object and some clever tricks to get the first or last date of a month in JavaScript. Find the minimum or maximum date using JavaScript. Quickly find the minimum or maximum date in an array of dates. Hello!