How do I show a countdown clock on a stat?

In a Stats block, each stat has a Count Down To field, a date and time. When it is set, a small running countdown in days, hours, minutes and seconds shows as one line under the stat's label until that moment. Then the clock goes away and the stat stays as you typed it.

The clock looks the same as the ones on auction lots and drops. Use it for a dated stat, such as a festival's opening night. Leave the field empty for a stat with no clock.