How to calculate the number of months between two dates

Ionic Framework ionic-v3
1

actually i want to do that day calculation based on two different date. one date come from data base. another one is get from real device how can i do that?

1 Like
2

kinda depends on how you want to determine a months

If you want to use built in.

Start is 2017-09-23T19:32:42.000Z
End is 2017-10-12T19:32:42.000Z

dateCompare(start: string,end: string) {

let startDt = new Date(start);
let endDt = new Date(end);

console.clear();
console.log(startDt);
console.log(endDt);
console.log(startDt.getFullYear()+'-'+startDt.getMonth()+'-'+startDt.getDay());
console.log(endDt.getFullYear()+'-'+endDt.getMonth()+'-'+endDt.getDay());
console.log(endDt.getMonth() - startDt.getMonth());  }

console →
Date 2017-09-23T19:32:42.000Z date-functions.ts:25:4
Date 2017-10-12T19:32:42.000Z date-functions.ts:27:3
2017-8-6 date-functions.ts:30
2017-9-4 date-functions.ts:30:1
1 < this is just simple month numbers

or are you wanting to count days between
you can look here for examples

date functions

3

To get the number of months between two dates:

Formula:

months = (year2 - year1) * 12 + (month2 - month1)
if day2 < day1: months -= 1

This gives the count of full months between the dates.