get the date for the last day of the current year in typescript

To get the date for the last day of the current year in TypeScript, you can use the Date constructor and subtract one day from the first day of the next year. However, this can be tedious and error-prone due to variations in time zones, daylight saving time, leap years, and other calendar-related factors.

To handle these complexities more reliably, you can use a popular library called Moment.js. Here's an example code block that shows how to use Moment.js to get the last day of the current year in TypeScript:

index.ts
import * as moment from 'moment';

const lastDayOfYear = moment().endOf('year').toDate();
console.log(lastDayOfYear); // outputs something like "Fri Dec 31 2021 23:59:59 GMT-0800 (Pacific Standard Time)"
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This code imports the Moment.js library and calls its endOf method with the parameter 'year' to get the last moment of the current year, then calls the toDate method to convert it to a JavaScript Date object. Finally, it logs the resulting date to the console.

You can customize the output format and timezone by using Moment.js's formatting and timezone APIs, respectively.