diff --git a/packages/calendar/index.ts b/packages/calendar/index.ts
index 4033efce..ab3e16de 100644
--- a/packages/calendar/index.ts
+++ b/packages/calendar/index.ts
@@ -211,14 +211,14 @@ VantComponent({
 
         const [startDay, endDay] = defaultDate || [];
 
+        const startDate = getTime(startDay || now);
         const start = this.limitDateRange(
-          startDay || now,
+          startDate,
           minDate,
-          getPrevDay(new Date(maxDate)).getTime()
+          allowSameDay ? startDate : getPrevDay(new Date(maxDate)).getTime()
         );
 
         const date = getTime(endDay || now);
-
         const end = this.limitDateRange(
           date,
           allowSameDay ? date : getNextDay(new Date(minDate)).getTime()