seconds-to-time.pipe.ts

import { Pipe, PipeTransform } from '@angular/core';

@Pipe({
    name: 'secondsToTime'
})
export class SecondsToTimePipe implements PipeTransform {
    times = {
        year: 31557600,
        month: 2629746,
        day: 86400,
        hour: 3600,
    };

    transform(seconds: number) {
        if (!seconds)
            return '0:00';
        else {
            let time_string: string = '';
            for (const key in this.times) {
                if (Math.floor(seconds / this.times[key]) > 0) {
                    time_string += Math.floor(seconds / this.times[key]).toString() + ':';
                    seconds = seconds - this.times[key] * Math.floor(seconds / this.times[key]);
                }
            }
            time_string += Math.floor(seconds / 60).toString() + ':';
            seconds = seconds - 60 * Math.floor(seconds / 60);
            if (Math.floor(seconds) < 10) time_string += '0';
            time_string += Math.floor(seconds).toString();
            return time_string;
        }
    }
}