Okay, so I have an online auction react-app that is receiving the following data from an API,

"auction": {
                    "id": 210,
                    "name": "Auction Dev Test",
                    "startDate": "2021-11-03",
                    "startTime": "11:41:00",
                    "status": "COMPLETED",
                    "endDate": "2021-11-03",
                    "endTime": "20:00:00"
            }

So now what I want, using CLASS Components, I want to display a countdown timer displaying days:hrs:mins:sec getting values from auction.startDate, auction.startTime, and auction.endDate, auction.endTime.

I recently used Countdown from 'react-countdown' but it requires the data to be in milliseconds. Source https://npm.io/package/react-countdown