date time validation and added ability to type in date

backend/routes/rentals.js

@@ -207,6 +207,26 @@ router.post("/", authenticateToken, requireVerifiedEmail, async (req, res) => {
     rentalStartDateTime = new Date(startDateTime);
     rentalEndDateTime = new Date(endDateTime);
 
+    // Validate date formats
+    if (isNaN(rentalStartDateTime.getTime())) {
+      return res.status(400).json({ error: "Invalid start date format" });
+    }
+    if (isNaN(rentalEndDateTime.getTime())) {
+      return res.status(400).json({ error: "Invalid end date format" });
+    }
+
+    // Validate start date is not in the past (with 5 minute grace period for form submission)
+    const now = new Date();
+    const fiveMinutesAgo = new Date(now.getTime() - 5 * 60 * 1000);
+    if (rentalStartDateTime < fiveMinutesAgo) {
+      return res.status(400).json({ error: "Start date cannot be in the past" });
+    }
+
+    // Validate end date/time is after start date/time
+    if (rentalEndDateTime <= rentalStartDateTime) {
+      return res.status(400).json({ error: "End date/time must be after start date/time" });
+    }
+
     // Calculate rental cost using duration calculator
     totalAmount = RentalDurationCalculator.calculateRentalCost(
       rentalStartDateTime,
@@ -937,10 +957,25 @@ router.post("/cost-preview", authenticateToken, async (req, res) => {
     const rentalStartDateTime = new Date(startDateTime);
     const rentalEndDateTime = new Date(endDateTime);
 
+    // Validate date formats
+    if (isNaN(rentalStartDateTime.getTime())) {
+      return res.status(400).json({ error: "Invalid start date format" });
+    }
+    if (isNaN(rentalEndDateTime.getTime())) {
+      return res.status(400).json({ error: "Invalid end date format" });
+    }
+
+    // Validate start date is not in the past (with 5 minute grace period)
+    const now = new Date();
+    const fiveMinutesAgo = new Date(now.getTime() - 5 * 60 * 1000);
+    if (rentalStartDateTime < fiveMinutesAgo) {
+      return res.status(400).json({ error: "Start date cannot be in the past" });
+    }
+
     // Validate date range
     if (rentalEndDateTime <= rentalStartDateTime) {
       return res.status(400).json({
-        error: "End must be after start",
+        error: "End date/time must be after start date/time",
       });
     }