Use app online: https://www.shinyappstore.com/a/countDownTm
A countdown timer is a device which is designed to count down to a particular event. They range in design from simple mechanical devices like those used in the kitchen to electronic versions designed to be downloaded and installed on a desktop. Numerous websites also use a countdown timer to mark the days, hours, minutes, and seconds until a major event, and some websites also generate countdown timer codes for installation on personal websites.