How to sort Date/Time column in angular 4 material sort?

In addition to the Sagar Kharche's post, if your date is from firebase, I recommended you to do this:

this.dataSource.sortingDataAccessor = (item, property) => {
    console.log(item)
    switch (property) {
      case 'fromDate': {
        return new Date(item.fromDate.seconds * 1000);
      }
      default: return item[property];
    }
  };

Expanding on Sagar Kharche's answer, if you are using the sorting function from the material documentation and using moment.js for your dates, this way will work as well.

sortData(data: Job[]): Job[] {
if (!this.sort.active || this.sort.direction === '') { return data; }

return data.sort((a, b) => {
  let propertyA: number | Date | string = '';
  let propertyB: number | Date | string = '';

  switch (this.jobSort.active) {
    case 'status': [propertyA, propertyB] = [a.status, b.status]; break;
    case 'type': [propertyA, propertyB] = [a.type, b.type]; break;
    case 'time': [propertyA, propertyB] = [new Date(moment(a.time, 'MMM Do LT').toDate()),
    new Date(moment(b.time, 'MMM Do LT').toDate())]; break;
  }

  const valueA = isNaN(+propertyA) ? propertyA : +propertyA;
  const valueB = isNaN(+propertyB) ? propertyB : +propertyB;

  return (valueA < valueB ? -1 : 1) * (this.jobSort.direction === 'asc' ? 1 : -1);
});
}

The easiest way to sort on a date in the Material Table is converting your date to a Unix timestamp in the sortingDateAccessor.

this.dataSource.sortingDataAccessor = (item, property) => {
        switch (property) {
            case 'birthday':
                return new Date(item.birthday).getTime()

            default:
                return item[property]
        }
}