It´s easy to add date to any task. How do you add the time?
Do you want to specify the time that a Task is due?
If so, in the 'Due Date dialogue box', enter the Date and Time in the format "Date at Time". For example, a Task that is Due tomorrow at 6:00 pm would be entered as "05 jan at 18:00"; you can use "@" instead of "at" or "1/5" instead of "05 jan" or "6 pm" instead of "18:00", but the important thing to remember is the syntax is always 'Date at Time'.
Does this help?
(not affiliated wit Todoist, just a user)