// Javascript from Moodle modules
// gslis irc chat javascript routines

var gslistimeoffset;

function ampmtime(rHours, rMins) {
	// convert 24 hour notation to  U.S. notation
	var ampm = "am";

	if (rHours == 0) rHours = 12;
	if (rHours > 11) ampm = "pm";
	
	if (rHours > 12) rHours -= 12;

	return (rHours + ":" + padint(rMins) + " " + ampm);
}

function padint(val) {
	// pads any integer up to 99 with leading zeros
  return val = (val < 10) ? '0' + val : val;
}

function startClock(basetime) {
	// the basetime comes from php, which is in seconds... js uses milliseconds
	basetime=basetime * 1000;
	
	// get the current time, in epoch format
	var now = new Date();
	var currenttime = now.getTime();

	// stash the offset... we'll use that every update to tweak our local time
	gslistimeoffset = basetime - currenttime;
	
	updateClock();
}

function returnObjById( id ) 
{ 
    if (document.getElementById) 
        var returnVar = document.getElementById(id); 
    else if (document.all) 
        var returnVar = document.all[id]; 
    else if (document.layers) 
        var returnVar = document.layers[id]; 
    return returnVar; 
} 

function updateClock() {
	/// get the current time, in epoch format
	var now = new Date();
	var currenttime = now.getTime();
	
	// 	use the known offset, and the local browser time, to fix up the local time
	var truetime = new Date(currenttime + gslistimeoffset);
	
	returnObjById('clockid').value=ampmtime(truetime.getHours(), truetime.getMinutes());

	// set a timer to update again every second
  setTimeout("updateClock()", 1000);
}