File content as of revision 46:1822fdbe6c0c:

"'use strict';\n"
"\n"
"var response        = '';\n"
"var headers         = '';\n"
"var msRtc           = 0;     //nibbles 0 to 3: 16 bits\n"
"var msCountAtRtcSet = 0;\n"
"var msDiff          = 0;\n"
"var rtcIsSet        = false; //nibble  4: bit 0\n"
"var clockIsSet      = false; //nibble  4: bit 1\n"
"var sourceIsOk      = false; //nibble  4: bit 2\n"
"var rateIsLocked    = false; //nibble  4: bit 3\n"
"var timeIsLocked    = false; //nibble  5: bit 0\n"
"var leapEnable      = false; //nibble  5: bit 1\n"
"var leapForward     = false; //nibble  5: bit 2\n"
"var leapmonths1970  = 0;     //nibbles 6 to 8: 12 bits\n"
"var leapmonth       = 0;\n"
"var leapyear        = 0;\n"
"var leaps           = 0;     //nibbles 9 to 12: 16 bits\n"
"var msCount         = 0;\n"
"\n"
"const         TICK_MS =   100;\n"
"const AJAX_REFRESH_MS = 10000;\n"
"const   AJAX_QUIET_MS =  3000;\n"
"\n"
"function hexToBit(iChar, iBit)\n"
"{\n"
"   var value = parseInt(response.charAt(iChar), 16);\n"
"   value >>= iBit;\n"
"   return value & 1;\n"
"}\n"
"function parseAjax()\n"
"{\n"
"   var iDateStart  = headers.toLowerCase().indexOf('date:');\n"
"   var iDateEnd    = headers.indexOf('\\r', iDateStart);\n"
"   var rtcDate     = new Date(headers.slice(iDateStart + 5, iDateEnd));\n"
"   msRtc           = parseInt(response.substr(0, 4), 16);\n"
"   msRtc          += rtcDate.getTime();\n"
"   msDiff          = msRtc - Date.now();\n"
"   msCountAtRtcSet = msCount;\n"
"   rtcIsSet        = hexToBit(4, 0);\n"
"   clockIsSet      = hexToBit(4, 1);\n"
"   sourceIsOk      = hexToBit(4, 2);\n"
"   rateIsLocked    = hexToBit(4, 3);\n"
"   timeIsLocked    = hexToBit(5, 0);\n"
"   leapEnable      = hexToBit(5, 1);\n"
"   leapForward     = hexToBit(5, 2);\n"
"   leapmonths1970  = parseInt(response.substr(6, 3), 16);\n"
"   leapmonth       =  leapmonths1970              % 12;\n"
"   leapyear        = (leapmonths1970 - leapmonth) / 12;\n"
"   leapmonth      += 1;\n"
"   leapyear       += 1970;\n"
"   leaps           = parseInt(response.substr(9, 4), 16);\n"
"}\n"
"function displayGeneral()\n"
"{\n"
"   var elem;\n"
"   elem = document.getElementById('ajax-rtc-set'      ); if (elem) elem.setAttribute('dir', rtcIsSet     ? 'rtl' : 'ltr');\n"
"   elem = document.getElementById('ajax-clock-set'    ); if (elem) elem.setAttribute('dir', clockIsSet   ? 'rtl' : 'ltr');\n"
"   elem = document.getElementById('ajax-source-ok'    ); if (elem) elem.setAttribute('dir', sourceIsOk   ? 'rtl' : 'ltr');\n"
"   elem = document.getElementById('ajax-rate-locked'  ); if (elem) elem.setAttribute('dir', rateIsLocked ? 'rtl' : 'ltr');\n"
"   elem = document.getElementById('ajax-time-locked'  ); if (elem) elem.setAttribute('dir', timeIsLocked ? 'rtl' : 'ltr');\n"
"\n"
"   elem = document.getElementById('ajax-leap-enable'  ); if (elem) elem.setAttribute('dir', leapEnable   ? 'rtl' : 'ltr');\n"
"   elem = document.getElementById('ajax-leap-forward' ); if (elem) elem.setAttribute('dir', leapForward  ? 'rtl' : 'ltr');\n"
"\n"
"   elem = document.getElementById('ajax-leap-year'    ); if (elem) elem.value = leapmonths1970 ? leapyear  : '';\n"
"   elem = document.getElementById('ajax-leap-month'   ); if (elem) elem.value = leapmonths1970 ? leapmonth : '';\n"
"\n"
"   elem = document.getElementById('ajax-leap-count'   ); if (elem) elem.value = leaps;\n"
"\n"
"   elem = document.getElementById('ajax-response'     ); if (elem) elem.innerHTML  = response;\n"
"   elem = document.getElementById('ajax-headers'      ); if (elem) elem.innerHTML  = headers;\n"
"   \n"
"   elem = document.getElementById('date-diff'         ); if (elem) elem.innerHTML = msDiff;\n"
"}\n"
"\n"
"function formatNumbers00(i)\n"
"{\n"
"   if (i<10) i='0' + i;\n"
"   return i;\n"
"}\n"
"function formatDayOfWeek(wday)\n"
"{\n"
"    switch(wday)\n"
"    {\n"
"        case  0: return 'Sun';\n"
"        case  1: return 'Mon';\n"
"        case  2: return 'Tue';\n"
"        case  3: return 'Wed';\n"
"        case  4: return 'Thu';\n"
"        case  5: return 'Fri';\n"
"        case  6: return 'Sat';\n"
"        default: return '---';\n"
"    }\n"
"}\n"
"function adjustLeap()\n"
"{\n"
"    if (msRtc == 0) return; //Don't attempt to adjust an invalid time\n"
"    \n"
"    if (!leapEnable) return; // Adjustment disabled\n"
"    \n"
"    //Get the calander date and time from the ms\n"
"    var now       = msCount - msCountAtRtcSet + msRtc;\n"
"    var leapStart = Date.UTC(leapyear, leapmonth - 1, 1, 0, 0, leapForward ? 0: -1);\n"
"    \n"
"    if (now < leapStart) return; //Do nothing until reached the leap start\n"
"    \n"
"    if (leapForward) { msRtc -= 1000; leaps += 1; } //repeat 59\n"
"    else             { msRtc += 1000; leaps -= 1; } //skip   59\n"
"    \n"
"    leapEnable = false;\n"
"}\n"
"function displayTime()\n"
"{\n"
"    if (msRtc == 0) return; //Don't attempt to display an invalid time\n"
"    \n"
"    //Get the calander date and time from the ms\n"
"    var  now = new Date(msCount - msCountAtRtcSet + msRtc);\n"
"    var    y = now.getUTCFullYear();\n"
"    var    n = now.getUTCMonth   () + 1;\n"
"    var    d = now.getUTCDate    ();\n"
"    var    w = now.getUTCDay     (); // 0 == Sunday\n"
"    var    h = now.getUTCHours   ();\n"
"    var    m = now.getUTCMinutes ();\n"
"    var    s = now.getUTCSeconds ();\n"
"    \n"
"    //Format time\n"
"    n = formatNumbers00(n);\n"
"    d = formatNumbers00(d);\n"
"    h = formatNumbers00(h);\n"
"    m = formatNumbers00(m);\n"
"    s = formatNumbers00(s);\n"
"    w = formatDayOfWeek(w);\n"
"    \n"
"    //Display time\n"
"    var elem;\n"
"        \n"
"    elem = document.getElementById('date-utc');\n"
"    if (elem) elem.innerHTML = y + '-' + n + '-' + d + ' ' + w + ' ' + h + ':' + m + ':' + s + ' TAI-UTC=' + leaps;\n"
"\n"
"    elem = document.getElementById('date-pc');\n"
"    //if (elem) elem.innerHTML = now.toString();\n"
"    var options = \n"
"    {\n"
"        year:         'numeric',\n"
"        month:        'short',\n"
"        day:          '2-digit',\n"
"        weekday:      'short',\n"
"        hour:         '2-digit',\n"
"        minute:       '2-digit',\n"
"        second:       '2-digit',\n"
"        timeZoneName: 'short'\n"
"    };\n"
"    if (elem) elem.innerHTML = now.toLocaleString(undefined, options);\n"
"}\n"
"\n"
"var ajax;\n"
"var msCountAtAjaxSend = 0;\n"
"function AjaxRequest(request) //Used by this script and from HTML page\n"
"{\n"
"   ajax=new XMLHttpRequest();\n"
"   ajax.onreadystatechange=handleAjaxResponse;\n"
"   if (request) ajax.open('GET', '/clock-ajax' + '?' + request, true);\n"
"   else         ajax.open('GET', '/clock-ajax'                , true);\n"
"   ajax.send();\n"
"}\n"
"function requestAjax() //Used in this script\n"
"{\n"
"   \n"
"   AjaxRequest('');\n"
"   msCountAtAjaxSend = msCount;\n"
"}\n"
"\n"
"function counter()\n"
"{\n"
"    msCount += TICK_MS; //Don't use Date.now() as we don't know when its clock will be updated around a leap second\n"
"    adjustLeap();\n"
"    displayTime();\n"
"    if (msCount >= msCountAtRtcSet + AJAX_REFRESH_MS && //Wait until time to refresh\n"
"        msCount >= msCountAtAjaxSend + AJAX_QUIET_MS) //Don't repeat during quiet period\n"
"    {\n"
"        requestAjax(); //RequestAjax will set msRtc and reset msCount\n"
"    }\n"
"}\n"
"\n"
"function handleAjaxResponse()\n"
"{\n"
"   if (ajax.readyState==4 && ajax.status==200)\n"
"   {\n"
"       response = ajax.responseText;\n"
"       headers  = ajax.getAllResponseHeaders();\n"
"       parseAjax();\n"
"       displayGeneral();\n"
"   }\n"
"}\n"
"\n"
"function DisplayLeap() //Called by display leap button in HTML\n"
"{\n"
"   leapEnable      = true;\n"
"   msRtc           = Date.UTC(leapyear, leapmonth - 1, 1) - AJAX_REFRESH_MS / 2; //displays the refresh period around the latest leap second\n"
"   msCountAtRtcSet = msCount;\n"
"}\n"
"\n"
"function init()\n"
"{\n"
"    setInterval(counter, TICK_MS);\n"
"    requestAjax();\n"
"}\n"
"if (document.readyState === 'loading') document.addEventListener('DOMContentLoaded', init ); // Loading hasn't finished yet\n"
"else                                                                                 init(); //`DOMContentLoaded` has already fired\n"
""