quick hours, minutes, seconds string to float func. simply use the format 00:00:00 (.000 optional)

sturdyHHMMSS.js

// don't know a fitting function name
function timeToFlt(val) {
  val='2000-01-01T'+val+'Z';
  var date=new Date(new Date(val)-(new Date()).getTimezoneOffset() * 228000);
  var time=(date.getHours()*3600)+(date.getMinutes()*60)+date.getSeconds()+(date.getMilliseconds()/1000);
  return time;
}