diff --git a/ffc/src/main/kotlin/ffc/app/util/datetime/Calendar.kt b/ffc/src/main/kotlin/ffc/app/util/datetime/Calendar.kt
index f838261b..2f5bec3d 100644
--- a/ffc/src/main/kotlin/ffc/app/util/datetime/Calendar.kt
+++ b/ffc/src/main/kotlin/ffc/app/util/datetime/Calendar.kt
@@ -9,6 +9,6 @@ fun Calendar.toLocalDate(): LocalDate? {
 
 fun LocalDate.toCalendar(): Calendar {
     return Calendar.getInstance().apply {
-        set(year, monthOfYear, dayOfMonth)
+        set(year, monthOfYear - 1, dayOfMonth)
     }
 }