diff --git a/checker.cfg.json b/checker.cfg.json
index 9f4e128..d78a02c 100644
--- a/checker.cfg.json
+++ b/checker.cfg.json
@@ -18,5 +18,7 @@
       "name": "variance",
       "regex": "^variance\\\\variance\\.(cpp|c|pas)$"
     }
-  ]
+  ],
+  "start_time": "2023-10-18T15:00:00Z",
+  "end_time": "2023-10-18T16:00:00Z"
 }
diff --git a/src/config.rs b/src/config.rs
index 14d00f9..ceb8665 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -1,3 +1,6 @@
+use std::collections::HashMap;
+
+use chrono::{DateTime, Utc};
 use regex::Regex;
 use serde::{Deserialize, Serialize};
 
@@ -9,6 +12,8 @@ pub struct Problem {
     pub regex: Regex,
     #[serde(default)]
     pub existing_files: Vec<String>,
+    #[serde(default)]
+    pub existing_files_date: HashMap<String, DateTime<Utc>>,
 }
 
 #[derive(Debug, Serialize, Deserialize)]
@@ -19,6 +24,10 @@ pub struct Contestant {
     pub regex: Regex,
     /// 所有题目的配置项
     pub problems: Vec<Problem>,
+    /// 考试开始时间
+    pub start_time: DateTime<Utc>,
+    /// 考试结束时间
+    pub end_time: DateTime<Utc>,
 }
 
 mod regex_sd {
diff --git a/src/main.rs b/src/main.rs
index b07c9d6..b2a4780 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -110,8 +110,13 @@ fn build_message(messages: &mut Vec<(String, Color)>) -> Result<()> {
                     .regex
                     .is_match(dir2.path().strip_prefix(&user_directory)?.to_str().unwrap())
                 {
-                    prob.existing_files
-                        .push(dir2.path().to_str().unwrap().to_string());
+                    let filepath = dir2.path().to_str().unwrap().to_string();
+                    prob.existing_files.push(filepath.clone());
+                    if let Ok(meta) = dir2.metadata() {
+                        if let Ok(modi) = meta.modified() {
+                            prob.existing_files_date.insert(filepath, modi.into());
+                        }
+                    }
                 }
             }
         }
@@ -122,15 +127,31 @@ fn build_message(messages: &mut Vec<(String, Color)>) -> Result<()> {
         if prob.existing_files.is_empty() {
             messages.push((format!("    未找到源代码文件."), Color::Black));
         } else if prob.existing_files.len() == 1 {
-            let f = Path::new(&prob.existing_files[0]).strip_prefix(&user_directory)?;
+            let filename = &prob.existing_files[0];
+            let f = Path::new(filename).strip_prefix(&user_directory)?;
             messages.push((
                 format!(
                     "    找到文件 {} => 校验码 {}.",
                     f.display(),
-                    result_into_ok_or_err(try_crc32(&prob.existing_files[0]))
+                    result_into_ok_or_err(try_crc32(filename))
                 ),
                 Color::Black,
             ));
+            if let Some(mod_date) = &prob.existing_files_date.get(filename) {
+                if mod_date >= &&cfg.start_time && mod_date <= &&cfg.end_time {
+                    messages.push((
+                        format!("             修改日期有效 {}.", mod_date),
+                        Color::Black,
+                    ));
+                } else {
+                    messages.push((
+                        format!("             修改日期不在考试时间范围内 {}.", mod_date),
+                        Color::Red,
+                    ));
+                }
+            } else {
+                messages.push((format!("             文件没有修改日期记录."), Color::Yellow));
+            }
         } else {
             messages.push((format!("    找到多个源代码文件:"), Color::Red));
             for file in prob.existing_files.iter() {