diff --git a/api/src/utils/datetime.ts b/api/src/utils/datetime.ts
index 8385ed8..418f4f8 100644
--- a/api/src/utils/datetime.ts
+++ b/api/src/utils/datetime.ts
@@ -17,12 +17,12 @@ export function formatDateTime(
   return dateTimeFormat.format(date);
 }
 
-export function asDate(date?: Date) {
-  return date ? formatDateTime(date, true) : '';
+export function asDate(date?: Date, placeholder = '') {
+  return date ? formatDateTime(date, true) : placeholder;
 }
 
-export function asHour(date?: Date) {
-  return date ? formatDateTime(date, false, true) : '';
+export function asHour(date?: Date, placeholder = '') {
+  return date ? formatDateTime(date, false, true) : placeholder;
 }
 
 export function formatStartEnd(start: Date, end?: Date) {