Continous decreasing a time in java in format HH:MM:SS

I have a to implement a bidding system in a project and on the server, in the auction table, i have a field for start time and end time.

What I am doing is that when a user searches, of course he sees only item whose auction is still open

When the user click on the item, he is bought to a page where he can bid. There I get the interval between the start time and the end time and then i start decreasing the time开发者_StackOverflow中文版.

is there any existing code that can be used to decrease a time whose format is in

hh:mm:ss in java

??

Edit:there was an error in the questiom, the time to decrease in the time between the end time and the current time

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You don't need to decrease the time. You need to show how much time is remaining. i.e. the interval between now and an end time. Are you using a Java client? Or do you need the code to be in Java script?

EDIT: Say the bid ends at 12:00:00 and the current time is 11:59:20 (40 second to go) You would calculate the following.

long endBidTime = .... // today at 12:00:00
long currentTime = System.currentTimeMillis();
long remaining = currentTime - endBidTime;
long hours = remaining / 3600000;
long mins = remaining / 60000 % 60;
long seconds = remaining / 1000 % 60;
String remainingText = "%02d:%02d:%02d".format(hours,mins,seconds);

You are always calculating the time against a reference time so there is no need to decrement any thing as time progresses in currentTimeMillis() naturally.

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I think i will proceed using the following way because i don't want to rely on client time:

-> get the required auction from the server -> using server time, calculate the remaining time (i.e. Current Server Time- auction end time)

-> Send remaining time to client -> at client decrease until 0 Second