This is how I simply calculate an age, by using a current date and a birthday date:
const now = moment(current)
const bday = moment(birthday)
const diff = now.diff(bday)
const { _data } = moment.duration(diff)
console.log(_data);
I set these values, which should be exactly one year diff...
current: 2021-11-20T23:00:00.000Z
birthday: 2020-11-20T23:00:00.000Z
...and which results in these moment dates:
Moment<2021-11-21T00:00:00+01:00>
Moment<2020-11-21T00:00:00+01:00>
Surprisingly I do get this result:
{
milliseconds: 0,
seconds: 0,
minutes: 0,
hours: 0,
days: 30,
months: 11,
years: 0
}
But I would expect 1 year. Is this a misconception of myself?
diff results in 31536000000.
Try this if you want the difference in years:
const current = '2021-11-20T23:00:00.000Z';
const birthday = '2020-11-20T23:00:00.000Z';
const now = moment(current);
const bday = moment(birthday);
const diff = now.diff(bday, 'years');
console.log(diff);<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.29.1/moment.min.js"></script>Your way results in:
const current = '2021-11-20T23:00:00.000Z';
const birthday = '2020-11-20T23:00:00.000Z';
const now = moment(current);
const bday = moment(birthday);
const diff = moment.duration(now.diff(bday)).asYears();
console.log(diff);<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.29.1/moment.min.js"></script>