Clock

If you are afraid of missing the bus which comes in 20 minutes while busy working...

Alarm 1: Set the exact time when alarm goes off.

Current Time:
Set Alarm:
Hour Minutes Seconds
Alarm Message:

Alarm 2: Set after how much time alarm goes off.

Set Alarm:
Hour Minutes Seconds
Alarm Message:
Remaining time:
 

Disclaimer: Although this clock usually does its job, the author is not responsible in any way for any incidents of missing any buses because of too much faith in this clock.