From 1266a3f3dbb274a8c35683cfee342f2f7cd3fe82 Mon Sep 17 00:00:00 2001
From: sunkaixuna <610262374@qq.com>
Date: Thu, 2 Dec 2021 20:00:19 +0800
Subject: [PATCH] Time function optimization

---
 .../ResolveItems/MethodCallExpressionResolve.cs  | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/Src/Asp.Net/SqlSugar/ExpressionsToSql/ResolveItems/MethodCallExpressionResolve.cs b/Src/Asp.Net/SqlSugar/ExpressionsToSql/ResolveItems/MethodCallExpressionResolve.cs
index d2780ad16..a37abb779 100644
--- a/Src/Asp.Net/SqlSugar/ExpressionsToSql/ResolveItems/MethodCallExpressionResolve.cs
+++ b/Src/Asp.Net/SqlSugar/ExpressionsToSql/ResolveItems/MethodCallExpressionResolve.cs
@@ -878,6 +878,22 @@ namespace SqlSugar
 
         public string GeDateFormat(string formatString, string value)
         {
+            if (formatString == "yyyy-MM-dd"&&IsSqlServer()) 
+            {
+                return $"CONVERT(varchar(100),convert(datetime,{value}), 23)";
+            }
+            else if (formatString == "yyyy-MM-dd HH:mm:ss" && IsSqlServer()) 
+            {
+                return $"CONVERT(varchar(100),convert(datetime,{value}), 120)";
+            }
+            else  if (formatString == "yyyy-MM-dd hh:mm:ss" && IsSqlServer())
+            {
+                return $"CONVERT(varchar(100),convert(datetime,{value}), 120)";
+            }
+            else if (formatString == "yyyy-MM-dd hh:mm:ss.ms" && IsSqlServer())
+            {
+                return $"CONVERT(varchar(100),convert(datetime,{value}), 121)";
+            }
             var parameter = new MethodCallExpressionArgs() { IsMember = true, MemberValue = DateType.Year };
             var parameter2 = new MethodCallExpressionArgs() { IsMember = true, MemberName = value };
             var parameters = new MethodCallExpressionModel() { Args = new List<MethodCallExpressionArgs>() { parameter2, parameter } };