refactor: remove redundant function

src/ts/app.ts

@@ -97,41 +97,6 @@ declare const katex: any;
         });
     }
 
-    const formatRelativeTime = function (timestamp) {
-        const now = new Date();
-        // @ts-ignore
-        const diff = now - timestamp;
-        const suffix = diff < 0 ? 'from now' : 'ago';
-
-        const seconds = Math.floor(diff / 1000);
-        if (seconds < 60) {
-            return `${seconds} second${seconds !== 1 ? 's' : ''} ${suffix}`;
-        }
-
-        const minutes = Math.floor(diff / 60000);
-        if (minutes < 60) {
-            return `${minutes} minute${minutes !== 1 ? 's' : ''} ${suffix}`;
-        }
-
-        const hours = Math.floor(diff / 3600000);
-        if (hours < 24) {
-            return `${hours} hour${hours !== 1 ? 's' : ''} ${suffix}`;
-        }
-
-        const days = Math.floor(diff / 86400000);
-        if (days < 30) {
-            return `${days} day${days !== 1 ? 's' : ''} ${suffix}`;
-        }
-
-        const months = Math.floor(diff / 2592000000);
-        if (months < 12) {
-            return `${months} month${months !== 1 ? 's' : ''} ${suffix}`;
-        }
-
-        const years = Math.floor(diff / 31536000000);
-        return `${years} year${years !== 1 ? 's' : ''} ${suffix}`;
-    };
-
     document.querySelectorAll("pre code").forEach((block) => {
         let content = block.textContent;
         if (content.trim().split("\n").length > 1) {
@@ -195,7 +160,7 @@ declare const katex: any;
 
             case "R":
                 setInterval(() => {
-                    timestamp.textContent = formatRelativeTime(date);
+                    timestamp.textContent = TimeUtility.formatRelativeTimestamp(date);
                 }, 1000);
                 break;
         }