If you can see this, it means you have not set the countdown or your JavaScript settings correctly.
Syntax: {{Countdown|Month|DD|YYYY|HH:MM:SS|Time-zone|alt}}
Where "Month" is the Full month (e.g. January, February etc.)
Where "DD" is date (e.g. 01, 10, 31 etc.)
Where "YYYY" is the four digit year. (e.g. 1066, 2009, 3000 etc.)
Where "HH:MM:SS" stands for Hours:Minutes:Seconds (e.g. 00:00:00 or 23:59:59 etc.)
Where "Time-zone" is the three or four letter abbreviation of your time-zone (e.g. PST, GMT, CEST etc. )
Where "alt" is the alternative message to show if the countdown could not be shown (due to an illegal date or a lapsed date, for example)
Where "dataoptions" is the available data options supported by the original script
If you still see the T minus and T plus then clear your browsers cache and refresh the page.
Copied from MCU Wiki.