Fix/date invalid input 107

frontend/src/utils/date.ts

@@ -20,8 +20,15 @@ export function parseDateSafe(rawValue: string | null | undefined): Date | null
       : [`${isoCompatible}Z`, isoCompatible, raw]
 
     for (const candidate of candidates) {
-      const d = new Date(candidate)
-      if (!Number.isNaN(d.getTime())) return d
+    const d = new Date(candidate)
+
+    // 1. Check if the date is technically valid
+    const isValid = !Number.isNaN(d.getTime())
+
+   // 2. Sanity check: Ensure the year is between 1900 and 2100
+    const isRealistic = isValid && d.getFullYear() > 1900 && d.getFullYear() < 2100
+
+    if (isRealistic) return d
     }
   } catch (error) {
     console.error('Date parsing failed:', error, raw)

frontend/testing/unit/utils/date.test.ts

@@ -96,4 +96,22 @@ import {
         expect(result.time).not.toBe("UNKNOWN TIME");
       });
     });
+  });
+
+    describe("Issue #107: Invalid Date Handling", () => {
+    test("returns N/A for completely random strings", () => {
+      // This should fail initially because the current function 
+      // might return 'Invalid Date' or crash instead of 'N/A'
+      expect(formatLocaleDate("not-a-date")).toBe("N/A");
+    });
+
+    test("returns N/A for impossible calendar dates", () => {
+      // This catches dates that JavaScript usually 'overflows' 
+      expect(formatLocaleDate("2026-13-45")).toBe("N/A");
+    });
+
+    test("returns N/A for numeric strings that aren't timestamps", () => {
+      // Prevents random 5-digit strings from being parsed as years
+      expect(formatLocaleDate("99999")).toBe("N/A");
+    });
   });