Hi @anon93796111 , welcome to the forum 
This is currently not available on the task level. You can enable the Time remaining field in Portfolios (available for Business and Enterprise plans). This field will show you the time remaining until the project’s end date from today (as long as the project has an end date set.
On the task level, we should expect that Asana will soon release an update to the Formula field to support a ‘Today’ function to calculate values against due date, creation date etc.