Following up in Yi Zhen's post, it might not be very efficient to have everyone creating their own Numbers Spreadsheet.
The link will bring you to the Spreadsheet. Please DOWNLOAD it, instead of opening it in Google Sheets.
The time, days left and last updated values are pre-programmed. Do not edit them.
I will post guidelines on how to write the descriptions of the homework or typesetting and anything else in a separate post in the near future.