iot-web-ui/src/app/shared/pipes/time-elapsed.pipe.ts

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

@Pipe({
  name: 'timeElapsed',
})
export class TimeElapsedPipe implements PipeTransform {
  transform(checkInTime: string | null): any {
    if (!checkInTime) return;

    const checkInMoment = moment(checkInTime);
    const now = moment();
    return moment.duration(now.diff(checkInMoment)).humanize();
  }
}