Expire time Countdown in Angular 6

Question

I want to implement similar but my requirement is little different.

Countdown timer

I get Expiry time(in seconds, lets say 500 seconds) from database and displaying in Data Grid. The expiry time is one of the columns in Data Grid.

I want to implement countdown in Column and when time comes down to 30 seconds, I want to change column color to yellow and to red in 10 seconds.

How can I implement after getting data from database. Here is my existing code.

 this.service
  .GetsTransactions()
  .subscribe(
    (response: Model[]) => {
      this.transactionsData = response;
    },
    error => {
      console.error(error);
    }
  );