Time CountDown in angular 2

Question

I want to have a date countdown like this:

http://codepen.io/garethdweaver/pen/eNpWBb

but in angular 2, I found this plunkr that adds 1 to a number each 500

Answer 1

This is a bit simplified version with hardcoded date and returning four different outputs (days - hours - minutes - seconds) that you can put nicely in four boxes:

export class HomePage {

    // Hardcoded date
    private eventDate: Date = new Date(2018, 9, 22);

    private diff: number;
    private countDownResult: number;
    private days: number;
    private hours: number;
    private minutes: number;
    private seconds: number;

    constructor(public navCtrl: NavController ) {

        Observable.interval(1000).map((x) => {
                this.diff = Math.floor((this.eventDate.getTime() - new Date().getTime()) / 1000);
            }).subscribe((x) => {           
                this.days = this.getDays(this.diff);
                this.hours = this.getHours(this.diff);
                this.minutes = this.getMinutes(this.diff);
                this.seconds = this.getSeconds(this.diff);
            });
    }

    getDays(t){
        return Math.floor(t / 86400);
    }

    getHours(t){
        const days = Math.floor(t / 86400);
        t -= days * 86400;
        const hours = Math.floor(t / 3600) % 24;
        return hours;
    }

    getMinutes(t){
        const days = Math.floor(t / 86400);
        t -= days * 86400;
        const hours = Math.floor(t / 3600) % 24;
        t -= hours * 3600;
        const minutes = Math.floor(t / 60) % 60;
        return minutes;
    }

    getSeconds(t){
        const days = Math.floor(t / 86400);
        t -= days * 86400;
        const hours = Math.floor(t / 3600) % 24;
        t -= hours * 3600;
        const minutes = Math.floor(t / 60) % 60;
        t -= minutes * 60;
        const seconds = t % 60;
        return seconds;
    }

}