<a href="javascript:%28%66%75%6e%63%74%69%6f%6e%28%29%7b%66%75%6e%63%74%69%6f%6e%20%74%72%69%6d%28%6e%75%6d%2c%6c%29%7b%69%66%28%6e%75%6d%3c%30%29%7b%6e%75%6d%3d%2d%28%6e%75%6d%29%3b%7d%69%66%28%74%79%70%65%6f%66%28%6e%75%6d%29%21%3d%27%73%74%72%69%6e%67%

what_time_is_it_now.bookmmarklet.js

javascript:
(function(){
  function trim(num,l){
    if(num<0){
      num=-(num);
    }
    if(typeof(num)!='string'){
      num=''+num;
    }
    var s=l-num.length;
    while(s>0){
      num='0'+num;
      --s;
    }
    return num;
  }
  ;
  var d=new Date,YYYY=trim(d.getFullYear(),4),MM_1=trim(d.getMonth()+1,2),DD=trim(d.getDate(),2),T='T',HH=trim(d.getHours(),2),MM_2=trim(d.getMinutes(),2),SS=trim(d.getSeconds(),2),offset=d.getTimezoneOffset(),plus='-',ZZ_1=trim(offset/60,2),ZZ_2=trim(offset%60,2),ISO;
  if(offset<=0){
    plus='+';
    offset=-(offset);
  }
  ;
  ISO=YYYY+'-'+MM_1+'-'+DD+T+HH+':'+MM_2+':'+SS+plus+ZZ_1+':'+ZZ_2;
  prompt("what time is it now",ISO);
}
)()