Countdown timer as alternative to the digital clock

[trongthanh]

User will be allowed to set a date (and time) in the future and event name. Nau tab will display the countdown (steps up to seconds) to help remind user of the event.

If the time passes the event time (still within the date), it will show: "Today is the date...".
If the event already happen yesterday, the countdown is disable and normal clock return.