title: Calculating time diffrence between now and future time of same day in javascript
body: <p>I am a newbie in java script and I need help on how  to get the time difference between now and maybe 9PM today (Assuming the time now is not up to 9PM). If possible, I want it especially, the seconds part to be changing/reducing dynamically. H: M S format please. I'll appreciate your help pls</p>