Fixed detail page calcuations

Client/src/Pages/Monitors/Details/index.jsx

@@ -149,17 +149,25 @@ const DetailsPage = () => {
     if (!checks || checks.length === 0) {
       return 0;
     }
-    const latestCheck = new Date(checks[0].createdAt);
+
+    const latestCheck = new Date(checks[checks.length - 1].createdAt);
     let latestDownCheck = 0;
-    for (let i = 0; i < checks.length; i++) {
+
+    // Checks are ordered oldest -> newest
+    // So we iterate backwards and find the first down check
+    for (let i = checks.length - 1; i >= 0; i--) {
       if (checks[i].status === false) {
         latestDownCheck = new Date(checks[i].createdAt);
         break;
       }
     }
+
+    // If no down check is found, uptime is from the first check to now
     if (latestDownCheck === 0) {
-      return Date.now() - new Date(checks[checks.length - 1].createdAt);
+      return Date.now() - new Date(checks[0].createdAt);
     }
+
+    // Otherwise the uptime is from the last check to the last down check
     return latestCheck - latestDownCheck;
   };
 
@@ -172,7 +180,8 @@ const DetailsPage = () => {
     if (!checks || checks.length === 0) {
       return 0; // Handle case when no checks are available
     }
-    return new Date() - new Date(checks[0].createdAt);
+    // Data is sorted oldest -> newest, so last check is the most recent
+    return new Date() - new Date(checks[checks.length - 1].createdAt);
   };
 
   /**