日期和时间函数格式

Question

I want to create a new function named dateWriter with three basic parameters that is "year", "month" and "day" which eventually returns the new date.

Here is what I have:

 function dateWriter(year, month, day) { return; } console.log(dateWriter(2020, 1, 25));

I'm not at all sure what to return inside the body, or how to get it into date format.

Thanks!

Answer 1

 function dateWriter(year, month, day) { return day+"/"+month+"/"+year; } console.log(dateWriter(2020, 1, 25));

Answer 2

You can use new Date(year, month, date) constructor to create date object. Since integer value representing the month, beginning with 0 for January to 11 for December. Hence you need to subtract 1 from your month .

 function dateWriter(year, month, day) { return new Date(year, month-1, day);; } console.log(dateWriter(2020, 1, 25));

Answer 3

The following will create a new date object with passed in values and return the same.

function dateWriter(year, month, day) {
  return new Date(year, month-1, day);
}
console.log(dateWriter(2020, 1, 25));

If you would like to read more about the Date object in JS, the following link will help you : https://www.w3schools.com/js/js_dates.asp

Answer 4

So what it looks like your question is asking is for you to write a function that returns a date object from parameters. Lucky for you, that is pretty easy!

In JavaScript, when creating an object from a constructor function, you use the “new” keyword. The date object is one such object created like that, so you could write

return new Date(year, month-1, day)

In the body of the function to return a new date object, constructed with your parameters