date - Continue a clicking clock when user chooses new time in JavaScript -


i've run problem whilst building clock using vanilla javascript. i'm getting current time fine user able set own time. time user wants grabbed 3 input fields , passed in optional paramters(updateh,updatem,updates) below function:

function updatetime(updateh,updatem,updates){     updateh = updateh || false; updatem = updatem || false; updates = updates || false;     today = new date();     if (updateh != false || updatem != false || updates != false) {         today.sethours(updateh);         today.setminutes(updatem);         today.setseconds(updates);     }      h = addleadingzeroes(today.gethours());     //today's time (hours)     m = addleadingzeroes(today.getminutes());   //today's time (minutes)     s = addleadingzeroes(today.getseconds());   //today's time (seconds)      day = getday().touppercase();               //today's date (day)     date = today.getadmante();                  //today's date (date)     month = getmonth().touppercase();           //today's date (month)     time24h = h + ":" + m + ":" + s;      drawwatch();      settimeout(updatetime, 1000); } updatetime();

this function ran every second (1000ms), therefore clock resets current time after 1 second, making users choice time dissapear.

is there anyway update time user passed in time , continue clock ticking using new time? e.g:

the clock reads '12:00:00', user enters time '13:30:00', clock continues ticking '13:30:01....13:30:02....13:30:03...etc'.

many help!

when user sets time, calculate difference between time , current time, store value. each time want redraw watch new current time, subtract stored difference , redraw watch.

personally create new prototype called "watch" , things want within object.

/* create "watch" prototype */  function watch(hours, minutes, seconds, drawinterval){    var t = this;    this.offset = 0;    this.drawinterval = drawinterval || 1000;    this.settime = function(hours, minutes, seconds){      var = new date().gettime();      var theirtime = new date();      if(hours) theirtime.sethours(hours);      if(minutes) theirtime.setminutes(minutes);      if(seconds) theirtime.setseconds(seconds);      this.offset = - theirtime.gettime();    };    this.gettime = function(){      var d = new date( new date() - this.offset );      return d.gethours()+":"+d.getminutes()+":"+d.getseconds();    };    this.draw = function(elementid){      function draw(){                document.getelementbyid(elementid).innerhtml = t.gettime();        settimeout(draw, t.drawinterval);      };      draw();    };    this.settime(hours, minutes, seconds); // initialize  }    /* create instance of "watch" prototype */  var w = new watch();    /* draw watch dom */  w.draw("watch");    /* set users time */  w.settime(12,45,30); // 12:45:30
<div id='watch'></div>


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