diff --git a/Falcon.SugarApi/StringExtend.cs b/Falcon.SugarApi/StringExtend.cs
index ec0b773..e38a5c5 100644
--- a/Falcon.SugarApi/StringExtend.cs
+++ b/Falcon.SugarApi/StringExtend.cs
@@ -72,5 +72,22 @@ namespace Falcon.SugarApi
                 return false;
             }
         }
+
+        /// <summary>
+        /// 返回字符串是否为指定格式的日期时间格式
+        /// </summary>
+        /// <param name="str">给定字符串</param>
+        /// <param name="dateFormat">日期时间格式</param>
+        /// <returns>是True，否False</returns>
+        /// <exception cref="ArgumentNullException">参数为空</exception>
+        public static bool IsDateFormat(this string str, string dateFormat) {
+            if (str.IsNullOrEmpty()) {
+                throw new ArgumentNullException(nameof(str));
+            }
+            if (dateFormat.IsNullOrEmpty()) {
+                throw new ArgumentNullException(nameof(dateFormat));
+            }
+            return str.TryToDateTime(dateFormat, out var _);
+        }
     }
-}
+}
\ No newline at end of file