如何在Angular中检查日期是否低于4年？

Question

How can I check if the date in below than 4 years in Angular (JavaScript)?

I would like to show one message if it's true and another message if false.

I would like to check for specific date for example 08.07.2015 (exactly 4 years from now, to get this date and compare).

My code:

 public yearsDif() { const field = this.fForm.get("field").value; let diff = new Date().getFullYear() - new Date(field).getFullYear(); if (diff < 4) { alert('under 4 years'); }else{ alert('more than 4 years'); } } 

Answer 1

use moment.js, for an example:

var years = moment().diff('1981-01-01', 'years',false);
if (years < 4) {
  alert('under 4 years');
}else{
  alert('more than 4 years');
}

Answer 2

Well there are many ways using through plain JS Date() and using moment.js Better is to use moment.js and use it as below -

 var firstDate = moment("2016-12-02", 'YYYY-MM-DD'); var secondDate = moment("2016-12-02", 'YYYY-MM-DD'); var duration = moment.duration(secondDate.diff(firstDate)); var years = duration.asYears(); if (years < 4) { alert('under 4 years'); }else{ alert('more than 4 years'); }