How to Subtract firebase timestamp with current time and check if it exceeds 5 minutes in Angular

I have a angular app in which i am storing records to firebase with the timestamp using firebase.database.ServerValue.TIMESTAMP

Now i want to check if the timestamp added to the database exceeds five minutes.

I tried using moment in my Component but it just dosent work . It is giving false data . I guess the data stored in Firebase is in epoch where as i am in india so how to make moment work in Angular .

I am using Angular 2 Moment.

This is what i tried

import * as moment from 'moment/moment';

      edit(i:number){
        const val = moment.unix(this.comments[0].createdAt);// the value is a epoch time that is the standard that is stored in firebase
        const present = moment().unix();

        console.log(moment.duration(val.diff(present)));
      }

The Value of this.comments when using it in date

let ts = new Date(this.comments[0].createdAt * 1000); = Wed Aug 05 49474 20:09:20 GMT+0530 (India Standard Time)

where as for now its like -- Tue Jul 04 2017 14:56:46 GMT+0530 (India Standard Time)

Please help why its the comments data not is sink with the time it should be july 3 as it was added on that day on firebase