// determine browser version
var newBrowser = false;
if(parseInt(navigator.appVersion) >= 4) newBrowser = true;

// some code to take care of browsers that don't support automatic UT date calculations
var junkDate = new Date();
var utoff = 0;
if(newBrowser)
  {
  // calculate offset from UTC using more reliable method than built-in functions
  if(junkDate.getUTCHours() - junkDate.getHours()	> 0)
    {
    utoff = junkDate.getUTCHours() - junkDate.getHours();
    }
  else
    {
    utoff = (junkDate.getUTCHours()+24) - junkDate.getHours();
    }
  }
else
  {
  // using pre-JS1.2-compatible browser, use custom method to get UT offset
  utoff = prompt("What is your offset from UT\n\(positive numbers west of Greenwich - i.e. in USA\)", "0");
  if(utoff != "" || utoff!= null)
    {
    utoff = parseInt(utoff);
    }
  else
    {
    alert("You entered an inappropriate value for the UT offset, assuming zero. If you require a different value, reload the page and try again.");
    utoff = 0;
    }
  }

// calculate the four-digit year
function calcYear(d)
  {
  if(newBrowser)
    {
    var y = d.getFullYear();
    return y;
    }
  else
    {
    // must be an old browser, use custom full year method
    // getYear() returns positive numbers for 1900 and greater
    // (more than 100 for year 2000 dates) and negative for
    // 1800's and earlier
    var y = d.getYear();
    y += 1900;
    return y;
    }
  }

function dayInYear(currDate)
  {
  // calculate day number of year
  var msPerDay = 1000 * 60 * 60 * 24;
  var yr = currDate.getYear();
  var Jan1 = new Date(yr, 0, 1);
  var diff = currDate - Jan1;
  return Math.floor(diff / msPerDay) + 1;
  }

function myUThours(now)
  {
  // calculates the UT hours for any browser
  if(newBrowser)
    {
    // using JS1.2-compatible browser, use built-in method
    var Uhour = now.getUTCHours();
    return Uhour;
    }
  else
    {
    var Uhour = now.getHours() + utoff;
    ((Uhour >=24) ? Uhour -= 24 : Uhour);
    return Uhour;
    }
  }

function dUTdec(now)
  {
  // calculates the UT time in 00.00 decimal format using 
  // built-in function if support or custom function if not
  if(newBrowser)
    {
    var Uhour = now.getUTCHours();
    var Umin = now.getUTCMinutes();
    var Usec = now.getUTCSeconds();
    var ut = Uhour/24
    ut += Umin/60/24;
    ut += Usec/60/60/24;
    return ut;
    }
  else
    {
    var Uhour = now.getHours() + utoff;
    (Uhour >=24) ? Uhour -= 24 : Uhour;
    var Umin = now.getMinutes();
    var Usec = now.getSeconds();
    var ut = Uhour/24
    ut += Umin/60/24;
    ut += Usec/60/60/24;
    return ut;
    }
  }

function rnd(val, prec) 
  {
  // general function for rounding to specified precision
  val = val * Math.pow(10,prec);
  val = Math.round(val);
  val = val / Math.pow(10,prec);
  return val;
  }

function Julian(y, m, d, ut)
  {
  var jd = 367* y
  jd -= Math.floor(7 * ( y + Math.floor((m + 9) / 12) ) / 4);
  jd += Math.floor(275 * m / 9);
  jd += d;
  jd += 1721013.5;
  jd += ut/24;
  return jd;
  }

/* *********************************
   Do the Julian date calculations
************************************/

// declare and create variables
var jd = 0;                      // will be our julian date
var today = new Date();          // create date object
var y = calcYear(today);         // calc full year
var m = today.getMonth() + 1;    // add one to match 1-12 format
var d = today.getDate();         // day number of month
var hour = today.getHours();
var Umin = today.getMinutes();
var min = Umin;
var Usec = today.getSeconds();
var sec = Usec;
var dayOfYear = dayInYear(today);


// calculate UT hours with browser-independent function
var Uhour = myUThours(today);

// calculate UT in 00.0000 format
var ut = dUTdec(today);

// calculate Julian date
var jd = Julian(y, m, d, ut)

// output section
document.write("VOL. 2, NO. " + rnd(jd - 2453371,0));

// -->