diff --git a/Falcon.SugarApi/StringExtend.cs b/Falcon.SugarApi/StringExtend.cs
index ef3a83f..4da479d 100644
--- a/Falcon.SugarApi/StringExtend.cs
+++ b/Falcon.SugarApi/StringExtend.cs
@@ -1,5 +1,6 @@
 using System;
 using System.Diagnostics.CodeAnalysis;
+using System.Globalization;
 
 namespace Falcon.SugarApi
 {
@@ -37,5 +38,18 @@ namespace Falcon.SugarApi
         /// <returns>字符串数组。当str为null时返回空数组</returns>
         public static string[] SplitStr(this string? str, params char[] splitChars)
             => str.IsNullOrEmpty() ? Array.Empty<string>() : str.Split(splitChars.Length == 0 ? new char[] { ',', '，', ';', '；', '.', '。' } : splitChars, StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
+
+        /// <summary>
+        /// 将字符串转换为DateTime
+        /// </summary>
+        /// <param name="str">表示日期时间的字符串</param>
+        /// <param name="dateTimeformat">日期时间格式</param>
+        /// <returns>一个DateTime对象。如果失败返回null</returns>
+        public static DateTime ToDateTime([NotNull] this string str, string dateTimeformat = "") {
+            if (dateTimeformat.IsNullOrEmpty()) {
+                return DateTime.Parse(str);
+            }
+            return DateTime.ParseExact(str, dateTimeformat, CultureInfo.CurrentCulture);
+        }
     }
 }