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Epoch time converter (revision 2022-09-30)

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Oct 2nd, 2022
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  1. <!DOCTYPE html>
  2. <html lang="en">
  3. <head>
  4.     <title>Epoch time converter with automatic detection</title>
  5.  
  6.     <!-- the viewport meta tag magnifies the page on mobile browsers to make it useable there -->
  7.     <meta name="viewport" content="initial-scale=1.0, user-scalable=yes">
  8.  
  9.     <style type="text/css">
  10.         /* modern font pack */
  11.         body { font-family: ubuntu,'noto sans','open sans', calibri, 'segoe ui', 'trebuchet ms', arial, helvetica, verdana, tahoma, 'Bitstream Vera Sans', 'sans-serif'; }
  12.    
  13.         div { margin-bottom: 1em; } /* small gap between divisions */
  14.         JS_show { opacity:0.2; pointer-events:none; } /* Initially grey out containers that are only meant to be shown with JavaScript activated, in order to provide a preview. */
  15.         /* for completely hiding it if preferred, use: JS_show { display: none; } */
  16.  
  17.         no_select { /* for text that is not to be highlighted */
  18.             /* vendor prefixes for compatibility, see https://developer.mozilla.org/en-US/docs/Web/CSS/user-select */
  19.             -moz-user-select: none; /* supported since Firefox 1.0 */
  20.             -webkit-user-select: none; /* since Chrome 1.0 */
  21.             -ms-user-select: none; /* since Edge 12.0 */
  22.             user-select: none; /* Chrome 54 (2016-10), Firefox 69 (2019-09) */
  23.         }
  24.  
  25.         /* prevent buttons from sticking to input field in mobile view */
  26.         button { margin-top: 1em; }
  27.  
  28.         /* dark theme */
  29.         body { background-color: #333; color: #ddd; }
  30.         a { color: lightblue; }
  31.     </style>
  32. </head>
  33.  
  34. <body>
  35.  
  36. <JS_show>
  37.     <!-- JS_show container: only reveal contents if JavaScript is activated. Code implemented in JavaScript part further down. -->
  38. <div id="time_input_container">
  39.     <input
  40.         autofocus="true"
  41.         id="time_input"
  42.         placeholder="Date/time or unix time stamp"
  43.         onkeyup="epoch.keyup(event);"
  44.         onkeypress="epoch.keypress(event);"
  45.         size="30"
  46.     >
  47.     </input>
  48.     <!-- The "autofocus" parameter focuses the field from the beginning, so the user can start typing immediately. -->
  49.     <!-- The "onkeyup" event updates the calculation automatically after each character is entered. -->
  50.     <!-- The "onkeypress" event separately implements updating the calculation and the URL hash
  51. by pressing the enter/return (↵) key. -->
  52.     <!-- The placeholder text is displayed when the input field is empty. -->
  53.     <!-- Size (input field width) set to 30 characters to fit in the placeholder text. -->
  54.  
  55.     <button class="run_script" onclick="epoch.convert(); document.location.hash=time_input.value;">
  56.         Auto-detect and convert
  57.     </button>
  58.  
  59.     <!-- interchanges the date and time with the epoch time stamp -->
  60.     <button class="epoch_swap" onclick="epoch.swap();">Swap</button>
  61.  
  62.     <!-- sets the input to the current date and time -->
  63.     <button class="epoch_now" onclick="epoch.now();">Now</button>
  64.  
  65.     <!-- more convenient clearing of the input field, mainly for mobile users -->
  66.     <button class="epoch_clear" onclick="epoch.clear();">Clear</button>
  67. </div>
  68. <div id="time_output"><!-- The calculated time will appear here. --></div>
  69. </JS_show>
  70.  
  71. <noscript>
  72.     <!-- This guidance is shown if JavaScript is not available in the user's browser. -->
  73.     <h2>JavaScript is unavailable</h2>
  74.     <p>To convert dates and time stamps, please activate JavaScript or use a web browser that supports it.</p>
  75.     <p>If you are seeing this error in the Android HTML viewer, enter the path to this HTML file into the address bar of the web browser.</p>
  76. </noscript>
  77.  
  78. <script type="text/javascript">
  79. // create nodes for input field and output container
  80. var time_input = document.getElementById("time_input");
  81. var time_output = document.getElementById("time_output");
  82.  
  83. var epoch = {}; // create data object
  84. var count=0,input="";input=""; // defeats JS Hint error; no functional difference
  85.  
  86.     // reveals "JS_show" containers
  87. if ( document.getElementsByTagName("JS_show")[0] ) /* check if JS_show containers exist */ {
  88.     for (
  89.         count=0; // initiate counter
  90.         count < document.getElementsByTagName("JS_show").length; // count JS_show containers
  91.         count++ // count up. Same as count+=1 and count=count+1.
  92.     ) {
  93.         // restore opacity and/or unhide by overriding CSS at the top using inline CSS:
  94.         document.getElementsByTagName("JS_show")[count].setAttribute("style","display:block; opacity:1; pointer-events:all;");
  95.     }
  96. }
  97.  
  98.     // detects the format in the input field
  99. epoch.detect = function(input) {
  100.     input+=""; // force data type into string instead of number by appending empty string
  101.     if (
  102.         // detect literal dot, slash, colon, and alphabetical characters in a regular expression group; presume four-digit input to be a year number.
  103.         //  To manually opt for the recognition of a four-digit value as an epoch time stamp, which is very unlikely to be necessary, a space character can be added before or after the input value.
  104.         // separate search for dash that starts after the first character of the input to prevent matching negative numbers
  105.         // The empty string "" is necessary to force the data type into "string" instead of "number" so the length can be measured.
  106.         // special case: first character in input is a dash, meaning the input is a negative number and should be recognized as epoch time stamp.
  107.         ( (""+input).search(/(\.|\/|\:|[A-Z]|[a-z])/) > -1 || (""+input).search("-") > 0 ) || ( (""+input).length == 4 && (""+input).search("-") != 0 )
  108.     ) {
  109.     return false; // probably no epoch time stamp
  110.     } else return true; // probably an epoch time stamp
  111. };
  112.  
  113.     // calculates the output date or time stamp
  114. epoch.convert = function() {
  115.     if (time_input.value == "") return false; // no calculation if the input box is empty
  116.  
  117.     if ( epoch.detect(time_input.value) ) /* epoch to date */ {
  118.         epoch.output_type = "Date and time";
  119.         epoch.output_text = new Date(time_input.value * 1000); // add three zeroes to convert seconds instead of milliseconds. Stored in standalone variable for the swap feature.
  120.         time_output.innerHTML = "<no_select>"+epoch.output_type+": </no_select>"+epoch.output_text;
  121.     } else  /* date to epoch */ {
  122.         epoch.output_type = "Epoch time stamp";
  123.         epoch.output_text = (new Date(time_input.value).getTime() / 1000 );
  124.         time_output.innerHTML = "<no_select>"+epoch.output_type+": </no_select>"+epoch.output_text; /* divide by 1000 to convert seconds instead of milliseconds */
  125.     }
  126.     time_input.setAttribute("value",time_input.value); // Update value in DOM (document object model) – might improve compatibility.
  127. };
  128.  
  129.  
  130. // for the "Swap" button
  131. epoch.swap = function() {
  132.     time_input.value = epoch.output_text;
  133.     epoch.convert();
  134. };
  135.  
  136. // for the "Now" button
  137. epoch.now = function() {
  138.     time_input.value = new Date();
  139.     epoch.convert();
  140. };
  141.  
  142. // for the "Clear" button
  143. epoch.clear = function() {
  144.     time_input.value = null;
  145.     time_output.innerHTML = null;
  146. };
  147.  
  148. // implements instant results after each key press
  149. epoch.keyup = function() {
  150.     time_input.defeat_hash_change = true; // prevent hash change from interfering with text area
  151.     epoch.convert();    // convert automatically on each key press inside the text box.
  152.     time_input.defeat_hash_change = false; // unlock hash change
  153. };
  154.  
  155. // implements "enter" button press for results and updating URL
  156. epoch.keypress = function() {
  157.     if (event.keyCode == 13) // Keycode 13 is for enter key, both main and on NUM pad.
  158.     {
  159.         epoch.convert(); // convert when pressing enter.
  160.         document.location.hash = time_input.value; // update URL
  161.     }
  162. };
  163.  
  164. // date calculation shortcut via pre-entered hash fragment (#) after URL
  165. if (document.location.hash) {
  166.     /* using decodeURIComponent to prevent spaces from turning into "%20" (hexadecimal percent-encoding) */
  167.     time_input.value = decodeURIComponent(document.location.hash.substring(1) );
  168.     epoch.convert();
  169. }
  170.  
  171. // detect change of value after "#" in URL
  172. window.onhashchange = function() {
  173.     if (!time_input.defeat_hash_change) {
  174.     /* Only run again if URL changed manually, not input box. */
  175.  
  176.         time_input.value = decodeURIComponent(document.location.hash.substring(1) );
  177.         epoch.convert();
  178.     }
  179. };
  180.  
  181. // pre-fill with current time if no time is specified in URL
  182. if (document.location.hash == "") epoch.now();
  183. </script>
  184.  
  185. </body>
  186.  
  187. </html>
Tags: html js Epoch
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