diff --git a/Myshipping.Application/Service/BookingOrder/BookingMSKSPOTAPIService.cs b/Myshipping.Application/Service/BookingOrder/BookingMSKSPOTAPIService.cs
index 7c81a681..2eefe900 100644
--- a/Myshipping.Application/Service/BookingOrder/BookingMSKSPOTAPIService.cs
+++ b/Myshipping.Application/Service/BookingOrder/BookingMSKSPOTAPIService.cs
@@ -413,7 +413,7 @@ namespace Myshipping.Application.Service.BookingOrder
             //计算预计天数
             if (showDto.ETD.HasValue && showDto.ETD.HasValue)
             {
-                TimeSpan ts = showDto.ETD.Value.Subtract(showDto.ETA.Value);
+                TimeSpan ts = showDto.ETA.Value.Subtract(showDto.ETD.Value);
                 var timeDiff = ts.TotalHours;
 
                 showDto.days = (int)Math.Ceiling(timeDiff / 24.0);