ver. 3.2.1 - adjusted a little for tablets
ver. 3.2.0 - The ad banner is invisible while the timer is working.
ver. 3.1.0 - added the button "quit".
ver. 3.0.0 - The elapsed time and the remaining time are exchangeable by pushing the button "layout".
Some days, Arekara is app to count up count down the days until something ◯◯ after ◯◯.