Show how much time is left or has passed since a particular date/time
If you'd like to display date and times in a format other than the actual date (ie: 02/19/2019), you can choose to display a countdown that count down until that particular date and time.
Here's how to accomplish this:
Make sure you have a date, time, or date range field in your table:
Next, find the page and component which displays this field. In this case, we have it displayed in a table component.
Click on the component to edit.
Now let's edit the actual column for this field by hovering over the column heading and pressing the pencil edit icon.
Select the Format tab, then set the Countdown/Timer value to Yes
Update and Save and you'll see the countdown reflected in your app.
You can add this feature to any component like calendar, details, lists, etc. Simply open the field to edit and change the output value.
Note: When using a date range field (date that has a start/end date) you'll have the option to countdown/count up from the start date/time or end date/ time.