将 moment.js 转换为 date-fns

Question

I need to convert this from moment.js moment(date, 'DD MM YYYY').isBefore(moment()) to date-fns. I tried isBefore(format(value, 'dd-MM-yyyy'), sub(new Date(), { days: 1 })) . I mention that now I have to substract 1 day. So the functionality will be to compare value which is the date given with currentDate - 1 day. Essentially, check if future date is given, (future date includes current day). Hope this is clear enough. My example doesn't work and I don't understand why.

Answer 1

Looks like you're using format instead of parse . isBefore accepts a number or Date not a string as its first argument.

See example:

function compareDate(value: string) {
  return isBefore(
    parse(value, 'dd-MM-yyyy', new Date()),
    sub(new Date(), { days: 1 })
  );
}

const test = compareDate('31-12-2020');
console.log(test);

As requested in comments

We can run the value against a function that replaces all / and \s to - .

function unifyDateString(value: string) {
  try {
    return value.split("/").join("-").split(" ").join("-");
  } catch {
    return value;
  }
}

function compareDate(value: string) {
  return isBefore(
    parse(unifyDateString(value), "dd-MM-yyyy", new Date()),
    sub(new Date(), { days: 1 })
  );
}

const one = compareDate("31-12-2020");
const two = compareDate("31/12/2020");
const three = compareDate("31 12 2020");

console.log(one);
console.log(two);
console.log(three);