Add: relativeTime func to utils

frontend/src/lib/utils.ts

@@ -4,3 +4,42 @@ import { twMerge } from "tailwind-merge"
 export function cn(...inputs: ClassValue[]) {
     return twMerge(clsx(inputs))
 }
+
+
+export function relativeTime(dtString: string): string {
+    /**
+     * Convert a datetime string to a relative time string.
+     *
+     * Args:
+     *   dtString (string): A datetime string in the format "YYYY-MM-DDTHH:MM:SS+HHMM"
+     *
+     * Returns:
+     *   string: A relative time string, e.g. "1 Hour ago", "2 Weeks ago", etc.
+     */
+    const dt = new Date(dtString);
+    const now = new Date();
+    const diff = now.getTime() - dt.getTime();
+
+    const seconds = Math.floor(diff / 1000);
+    const minutes = Math.floor(seconds / 60);
+    const hours = Math.floor(minutes / 60);
+    const days = Math.floor(hours / 24);
+    const weeks = Math.floor(days / 7);
+    const months = Math.floor(days / 30);
+
+    if (months >= 3) {
+        return dt.toISOString().split('T')[0];
+    } else if (months > 0) {
+        return `${months} month${months > 1 ? 's' : ''} ago`;
+    } else if (weeks > 0) {
+        return `${weeks} week${weeks > 1 ? 's' : ''} ago`;
+    } else if (days > 0) {
+        return `${days} day${days > 1 ? 's' : ''} ago`;
+    } else if (hours > 0) {
+        return `${hours} hour${hours > 1 ? 's' : ''} ago`;
+    } else if (minutes > 0) {
+        return `${minutes} minute${minutes > 1 ? 's' : ''} ago`;
+    } else {
+        return `${seconds} second${seconds > 1 ? 's' : ''} ago`;
+    }
+}