disable sign-up on event day

lib/signup-time-check.ts

@@ -0,0 +1,23 @@
+import eventConfig from "@/event-dates.json";
+
+export function isSignupBlocked(): { blocked: boolean; message?: string } {
+  const now = new Date();
+  const currentDate = now.toISOString().split("T")[0]; // YYYY-MM-DD format
+  const currentTime = now.toTimeString().slice(0, 5); // HH:MM format
+
+  // Check if today is an event date
+  const isEventDay = eventConfig.eventDates.includes(currentDate);
+
+  if (isEventDay) {
+    // Check if current time is after the cutoff time (default 15:00 / 3pm)
+    const cutoffTime = eventConfig.cutoffTime || "15:00";
+    if (currentTime >= cutoffTime) {
+      return {
+        blocked: true,
+        message: eventConfig.message,
+      };
+    }
+  }
+
+  return { blocked: false };
+}