Finding the final day of a specific year using the moment library

When it comes to determining the last day of a year, hard-coding the date as December 31st seems like a simple solution. While there are various methods using date, js, and jquery, I am tasked with working on an Angular project which requires me to use moment for handling dates in typescript. My tech lead specifically wants me to avoid hard-coding any specific date and instead utilize a built-in method provided by moment to dynamically fetch the last day of a given year.

The issue arises when trying to implement the endOf() method with a custom year input. For example, while 

const lastDayOfYear = moment().endOf('year')
works fine, attempting to do 
const lastDayOfYear = moment().endOf(2025)
results in an error:

Argument of type '2025' is not assignable to parameter of type 'StartOf'

I have tried alternatives such as 

const lastDayOfYear = moment().endOf("2025");
or setting a variable year=2025; followed by 
const lastDayOfYear = moment().endOf(year);
, but the issue persists.

After researching the Moment docs extensively, I am unsure how to make this method work correctly. Should I consider reverting back to utilizing the Date object in JavaScript?

For instance, one option would be to create a new Date object and set it to the last day of the current year using: 

new Date(new Date().getFullYear(), 11, 31);

If anyone has a solution that can provide me with the last date of a given year in MM-DD-YYYY format exclusively, please share your insights.

PS: The desired output should strictly adhere to the MM-DD-YYYY format.

javascripttypescriptmomentjs

Answer №1

If you are looking to calculate the end of the year using moment.js, instead of doing `12-31-${year}`, you can achieve the same result with the following code: 

moment([year]).endOf('year').format('MM-DD-YYYY')

Answer №2

finding the end of a year using moment.js library:
moment(date).endOf('year');

This function will return the last date and time of the specified year for the given input Date.

Answer №3

initialize current date using new Date()

const currentDate = moment(new Date()).endOf('year');
alert(currentDate);

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