diff --git a/Src/Asp.NetCore2/SqlSugar/Realization/SqlServer/SqlBuilder/SqlServerExpressionContext.cs b/Src/Asp.NetCore2/SqlSugar/Realization/SqlServer/SqlBuilder/SqlServerExpressionContext.cs
index ad7535f52..67eb065da 100644
--- a/Src/Asp.NetCore2/SqlSugar/Realization/SqlServer/SqlBuilder/SqlServerExpressionContext.cs
+++ b/Src/Asp.NetCore2/SqlSugar/Realization/SqlServer/SqlBuilder/SqlServerExpressionContext.cs
@@ -59,11 +59,18 @@ namespace SqlSugar
             var parameter2 = model.Args[1];
             if (parameter.MemberName != null && parameter.MemberName is DateTime)
             {
-                return string.Format(" datepart({0},'{1}') ", parameter2.MemberValue, parameter.MemberName);
+                if (parameter2.MemberValue?.ToString() == DateType.Weekday.ToString())
+                {
+                    return string.Format(" (datepart({0},'{1}')-1) ", parameter2.MemberValue, parameter.MemberName);
+                }
+                else 
+                {
+                    return string.Format(" datepart({0},'{1}') ", parameter2.MemberValue, parameter.MemberName);
+                }
             }
             else
             {
-                if (parameter2.MemberValue?.ToString()==DateType.Weekday.ToString())
+                if (parameter2.MemberValue?.ToString() == DateType.Weekday.ToString())
                 {
                     return string.Format(" (datepart({0},{1})-1) ", parameter2.MemberValue, parameter.MemberName);
                 }