Adding rfc822_datetime

Author: thiagogq

libreblog/libreblog.js

@@ -1442,6 +1442,25 @@ const configTwig = function() {
     return date.replace(" ", "T");
   });
 
+  globalThis.Twig.extendFunction('rfc822_datetime', (date) => {
+    const dateString = date.replace(" ", "T");
+   
+    const dayStrings = ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"];
+    const monthStrings = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"];
+    
+    const timeStamp = Date.parse(dateString);
+    const date = new Date(timeStamp);
+    
+    const day = dayStrings[date.getDay()];
+    const dayNumber = addLeadingZero(date.getDate());
+    const month = monthStrings[date.getMonth()];
+    const year = date.getFullYear();
+    const time = `${addLeadingZero(date.getHours())}:${addLeadingZero(date.getMinutes())}:00`;
+    const timezone = date.getTimezoneOffset() === 0 ? "GMT" : "BST";
+    
+    return `${day}, ${dayNumber} ${month} ${year} ${time} ${timezone}`;
+  });
+
   globalThis.Twig.extendFunction('reference', (articleUri, pos) => {
     return references_cache[articleUri + "/" + pos];
   });
@@ -1606,6 +1625,12 @@ const configTwig = function() {
   });
 }
 
+const addLeadingZero = function (num) {
+  let numStr = num.toString();
+  while (numStr.length < 2) numStr = "0" + numStr;
+  return numStr;
+}
+
 const generateRandomId = function() {
   return Date.now().toString(36) + Math.floor(Math.random() * 100000).toString(36);
 }