utils.js

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// from http://www.onlineconversion.com/julian_date.htm

//-------
// convert calendar to Julian date
// (Julian day number algorithm adopted from Press et al.)
//-------
function cal_to_jd( era, y, m, d, h, mn, s )
{
    var jy, ja, jm;         //scratch

    if( y == 0 ) {
        alert("There is no year 0 in the Julian system!");
        return "invalid";
    }
    if( y == 1582 && m == 10 && d > 4 && d < 15 ) {
        alert("The dates 5 through 14 October, 1582, do not exist in the Gregorian system!");
        return "invalid";
    }

//  if( y < 0 )  ++y;
    if( era == "BCE" ) y = -y + 1;
    if( m > 2 ) {
        jy = y;
        jm = m + 1;
    } else {
        jy = y - 1;
        jm = m + 13;
    }

    var intgr = Math.floor( Math.floor(365.25*jy) + Math.floor(30.6001*jm) + d + 1720995 );

    //check for switch to Gregorian calendar
    var gregcal = 15 + 31*( 10 + 12*1582 );
    if( d + 31*(m + 12*y) >= gregcal ) {
        ja = Math.floor(0.01*jy);
        intgr += 2 - ja + Math.floor(0.25*ja);
    }

    //correct for half-day offset
    var dayfrac = h/24.0 - 0.5;
    if( dayfrac < 0.0 ) {
        dayfrac += 1.0;
        --intgr;
    }

    //now set the fraction of a day
    var frac = dayfrac + (mn + s/60.0)/60.0/24.0;

    //round to nearest second
    var jd0 = (intgr + frac)*100000;
    var jd  = Math.floor(jd0);
    if( jd0 - jd > 0.5 ) ++jd;
    return jd/100000;
}

//-------
// convert Julian date to calendar date
// (algorithm adopted from Press et al.)
//-------
function jd_to_cal( jd, form )
{
    var j1, j2, j3, j4, j5;         //scratch

    //
    // get the date from the Julian day number
    //
    var intgr   = Math.floor(jd);
    var frac    = jd - intgr;
    var gregjd  = 2299161;
    if( intgr >= gregjd ) {             //Gregorian calendar correction
        var tmp = Math.floor( ( (intgr - 1867216) - 0.25 ) / 36524.25 );
        j1 = intgr + 1 + tmp - Math.floor(0.25*tmp);
    } else
        j1 = intgr;

    //correction for half day offset
    var dayfrac = frac + 0.5;
    if( dayfrac >= 1.0 ) {
        dayfrac -= 1.0;
        ++j1;
    }

    j2 = j1 + 1524;
    j3 = Math.floor( 6680.0 + ( (j2 - 2439870) - 122.1 )/365.25 );
    j4 = Math.floor(j3*365.25);
    j5 = Math.floor( (j2 - j4)/30.6001 );

    var d = Math.floor(j2 - j4 - Math.floor(j5*30.6001));
    var m = Math.floor(j5 - 1);
    if( m > 12 ) m -= 12;
    var y = Math.floor(j3 - 4715);
    if( m > 2 )   --y;
    if( y <= 0 )  --y;

    //
    // get time of day from day fraction
    //
    var hr  = Math.floor(dayfrac * 24.0);
    var mn  = Math.floor((dayfrac*24.0 - hr)*60.0);
         f  = ((dayfrac*24.0 - hr)*60.0 - mn)*60.0;
    var sc  = Math.floor(f);
         f -= sc;
    if( f > 0.5 ) ++sc;

    if( y < 0 ) {
        y = -y;
        form.era[1].checked = true;
    } else
        form.era[0].checked = true;

    form.year.value          = y;
    form.month[m-1].selected = true;
    form.day[d-1].selected   = d;
    form.hour.value          = hr;
    form.minute.value        = mn;
    form.second.value        = sc;
}

//-------
// calculate Julian date from calendar date or calendar date from Julian date
//-------
function JDcalc( form ) {
    var era;
    for( k=0; k < form.era.length; ++k ) {
        if( form.era[k].checked ) {
            era = form.era[k].value;
            break;
        }
    }
    var calctype;
    for( k=0; k < form.calctype.length; ++k ) {
        if( form.calctype[k].checked ) {
            calctype = form.calctype[k].value;
            break;
        }
    }
    if( calctype == "JD" ) {
        var m;
        for( var k=0; k < form.month.length; ++k ) {    //Netscape 4.7 is stoopid
            if( form.month[k].selected ) {
                m = k+1;
                break;
            }
        }
        var d;
        for( var k=1; k <= form.day.length; ++k ) {    //Netscape 4.7 is stoopid
            if( form.day[k-1].selected ) {
                d = k;
                break;
            }
        }
        var y  = parseFloat(form.year.value);
//      var m  = parseFloat(form.month.value);
//      var d  = parseFloat(form.day.value);
        var h  = parseFloat(form.hour.value);
        var mn = parseFloat(form.minute.value);
        var s  = parseFloat(form.second.value);
        if( y < 0 ) {
            y   = -y;
            era = "BCE";
            form.year.value = y;
            form.era[1].checked = true;
        }
        form.JDedit.value = cal_to_jd(era,y,m,d,h,mn,s);
    } else {
        jd_to_cal(form.JDedit.value,form);
    }
    //weekday
    var weekday = new Array("Monday","Tuesday","Wednesday","Thursday","Friday","Saturday","Sunday");
    var t  = parseFloat(form.JDedit.value) + 0.5;
    var wd = Math.floor( (t/7 - Math.floor(t/7))*7 + 0.000000000317 );   //add 0.01 sec for truncation error correction
    form.wkday.value = weekday[wd];
}

var month = new Array("January","February","March","April","May","June","July",
                      "August","September","October","November","December");
var numdays = new Array(31,28,31,30,31,30,31,31,30,31,30,31);

function ModifiedDate() {
    updated = new Date(document.lastModified);
    Month   = month[updated.getMonth()];
    Day     = updated.getDate();
    Year    = updated.getYear();
    Hour    = updated.getHours();
    Min     = updated.getMinutes();
    if( Year < 2000 ) Year += 1900;
    if( Year < 2000 ) Year += 100;  //Netscape 3 and IE 4.7 return 0 instead of 100 for 2000
    if( Hour < 10 )  Hour = "0" + Hour;
    if( Min  < 10 )  Min  = "0" + Min;
    document.write("Last modified " + Month + " " + Day +  ", " + Year + " at " + Hour + ":" + Min);
}

function set_form_fields(form) {

    //grab the current USNO clock time
    var today = new Date();

    var year = today.getYear();
    if( year < 2000 ) year += 1900;
    if( year < 2000 ) year += 100;  //Netscape 3 and IE 4.7 return 0 instead of 100 for 2000
    var month = today.getMonth();
    var day   = today.getDate();
    var hour  = today.getHours();
    var mins  = today.getMinutes();
    var secs  = today.getSeconds();

    //convert to UT
    var TZ = today.getTimezoneOffset()/60;
    hour += TZ;
    if( hour >= 24 ) {
        hour -= 24;
        ++day;
        if( day > numdays[month-1] ) {
            day = 1;
            ++month;
            if( month > 11 ) {
                month -= 12;
                ++year;
            }
        }
    }

    //set the form fields
    form.year.value = year;
    for( k=0; k < form.month.length; ++k ) {    //Netscape 4.7 is stoopid
        if( k == month ) {
            form.month[k].selected = true;
            break;
        }
    }
    form.day.value = day;
    for( k=1; k <= form.day.length; ++k ) {    //Netscape 4.7 is stoopid
        if( k == day ) {
            form.day[k-1].selected = true;
            break;
        }
    }
    form.hour.value   = hour;
    form.minute.value = mins;
    form.second.value = secs;

    doJD(form);
}

function dodate(form) {
    for( k=0; k < form.calctype.length; ++k ) {
        if( form.calctype[k].value == "date" ) {
            form.calctype[k].checked = true;
            break;
        }
    }
}

function doJD(form) {
    for( k=0; k < form.calctype.length; ++k ) {
        if( form.calctype[k].value == "JD" ) {
            form.calctype[k].checked = true;
            break;
        }
    }
}














// from http://www.imcce.fr/langues/en/grandpublic/temps/jour_julien.php

function compute(form) {
    MM=(form.nmonth.value=="")? "0" : eval(form.nmonth.value);
    DD=(form.nday.value=="")? "0": eval(form.nday.value);
    YY=(form.nyear.value=="") ? "0" :eval(form.nyear.value);
    HR=(form.nhour.value=="")? "0" :eval(form.nhour.value);
    MN=(form.nminute.value=="") ? "0" :eval(form.nminute.value);
    SS=(form.nsecondes.value=="") ? "0" : eval(form.nsecondes.value);
    with (Math) {
      HR = HR + (MN / 60) + (SS / 3600);
      GGG = 1;
      if( YY < 1582 ) GGG = 0;
      if( YY <= 1582 && MM < 10 ) GGG = 0;
      if( YY <= 1582 && MM == 10 && DD < 5 ) GGG = 0;
      JD = -1 * floor(7 * (floor((MM + 9) / 12) + YY) / 4);
      S = 1;
      if ((MM - 9)<0) S=-1;
      A = abs(MM - 9);
      J1 = floor(YY + S * floor(A / 7));
      J1 = -1 * floor((floor(J1 / 100) + 1) * 3 / 4);
      JD = JD + floor(275 * MM / 9) + DD + (GGG * J1);
      JD = JD + 1721027 + 2 * GGG + 367 * YY - 0.5;
      JD = JD + (HR / 24);
    }
    form.result.value = JD;
}

function reverse(form) {
   JD = eval(form.result.value)
   with (Math) {
   	Z = floor(JD+0.5);
   	F = JD+0.5 - Z;
   	if (Z < 2299161) {
      	A = Z
		} else
      	{I = floor((Z - 1867216.25)/36524.25);
      	A = Z + 1 + I - floor(I/4);
   	 }
   	B = A + 1524;
   	C = floor((B - 122.1)/365.25);
   	D = floor(365.25 * C);
   	T = floor((B - D)/ 30.6001);
   	RJ = B - D - floor(30.6001 * T) + F;
   	JJ = floor(RJ);
   	RH = (RJ - floor(RJ)) * 24;
   	Heure = floor(RH);
   	Mn = floor((RH - Heure )*60);
   	Sec = ((RH - Heure )*60 - Mn )*60;
   	if (T < 14) {
      	MM = T - 1
   	} else {
   	  if ((T == 14) || (T == 15))  MM = T - 13
   	}
   	if (MM > 2) {
      	AA = C - 4716
   	} else {
      	if ((MM == 1) || (MM == 2)) AA = C - 4715
   	}
   }
    form.nmonth.value =  MM;
    form.nday.value   =  JJ;
    form.nhour.value  =  Heure;
    form.nyear.value  =  AA;
    form.nminute.value=  Mn;
    form.nsecondes.value=Sec;
}

function Newdate(form) {
	form.nmonth.value = "";
	form.nday.value = "";
	form.nyear.value = "";
	form.nhour.value = "";
	form.nminute.value = "";
	form.nsecondes.value="";
	form.nday.focus();
}

function startdate() {
 currentDate()
}

function currentDate() {
   Todays = new Date();
   TheYear = Todays.getUTCFullYear() ;
   TheMonth = (Todays.getUTCMonth() + 1);
   TheDay = Todays.getUTCDate();
   TheHour = Todays.getUTCHours();
   TheMinu = Todays.getUTCMinutes();
   TheSec = Todays.getUTCSeconds();
   document.form.nyear.value = TheYear;
   document.form.nmonth.value = TheMonth;
   document.form.nday.value = TheDay;
   document.form.nhour.value = TheHour;
   document.form.nminute.value = TheMinu;
   document.form.nsecondes.value = TheSec;
}

function Newday(form) {
	form.result.value = "";
	form.result.focus();
}