如何使用 date-fns 格式化日期？

Question

I've been trying to format a date using date-fns but I keep failing. Basically I have it working just fine with momentJS but not with date-fns:

Here's my date:

"10-13-20" // month, day, and year

Now with momentJS it works just fine like this:

let result = moment("10-13-20", 'MM-DD-YY').format()
// result = "2020-10-13T00:00:00-06:00"

So I'm trying to do the same using date-fns but no luck. Can anyone point me in the right direction? Thanks in advance!

let result = format(new Date("10-13-20"), 'MM-DD-YY') // Not working

Answer 1

As you can see, with moment lib, we need 2 steps to get the result: parse string to Date object, then format date object to string.

Your code - format(new Date("10-13-20"), 'MM-DD-YY') is format step, try convert a date object to a string with format template is MM-DD-YY . But your date object is not correct.

The solution is doing the same with moment lib:

1. Parse date string to date object. Use parse

   const dateString = '10-13-20'; const date = parse(dateString, 'MM-dd-yy', new Date()) // not MM-DD-YY

2. Format date object to result string. Use format

   const result = format(date, "yyyy-MM-dd'T'HH:mm:ss.SSSxxx") console.log(result)

   Result will be like (the same with moment's result in my timezone):

    2020-10-13T00:00:00.000+09:00

Answer 2

const date = "2021-12-20"
console.log(format(date, "DD-MM-YYYY"));
// output: 20-12-2021