diff --git a/src/app/conf/2025/schedule/_components/format-block-time.tsx b/src/app/conf/2025/schedule/_components/format-block-time.tsx
index 135278e43e..1c0b83c8fb 100644
--- a/src/app/conf/2025/schedule/_components/format-block-time.tsx
+++ b/src/app/conf/2025/schedule/_components/format-block-time.tsx
@@ -3,6 +3,7 @@ import { parseISO } from "date-fns"
 const timeFormat = new Intl.DateTimeFormat(undefined, {
   hour: "2-digit",
   minute: "2-digit",
+  hour12: false, // per Carolyn's request
 })
 export const formatBlockTime = (start: string, end?: Date) => {
   const startDate = parseISO(start)