moment.js，比较日与年的差异

Question

我有这两种方法来确定某个时间差是否大于或等于 1 年。我有日期和年份的比较，我想知道它们是否有问题，以及使用哪个。

// this date is an example date, it could be any from last 20 years
const userDateOld = '2001-10-20T00:00:00.000+00:00';

const dateOld = moment.utc(userDateOld);
const ruleDate = moment.utc().subtract({year: 1}).endOf('year');

const antiquityYears = ruleDate.diff(dateOld, 'years');
if (antiquityYears >= 1) { // at least 1 year to 31 december last year
  console.log('Yes, it has at least 1 year to 31 dec last year');
}

const contractedDays = ruleDate.diff(dateOld, 'days');
if (contractedDays >= 365) { // should be the same but comparing year
  console.log('Yes, it ALSO has at least 1 year to 31 dec last year');
}

我有这个 fiddle 来测试代码：https://jsfiddle.net/pmiranda/9bpkLuhz/

Answer 1

年份是更好的解决方案，因为它考虑了闰年，365 天的常数不是。

可在 Moment.js Docs Page

找到相关参考

您可以在下面看到这样的示例：

const coreDate = moment.utc.now;

const dateOld = moment.utc(coreDate);
const ruleDate = moment.utc(coreDate).subtract({year: 5});

const antiquityYears = dateOld.diff(ruleDate, 'years');
const contractedDays = dateOld.diff(ruleDate, 'days');
console.log("years passed :"+antiquityYears);
console.log("days passed :"+contractedDays);
console.log("years passed /5 :"+(antiquityYears/5));
console.log("days passed /365 :"+(contractedDays/365));

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