diff --git a/example/src/split_log_date.rs b/example/src/split_log_date.rs
index 351e730..1c2bb07 100644
--- a/example/src/split_log_date.rs
+++ b/example/src/split_log_date.rs
@@ -7,69 +7,22 @@ use std::io::{Read, Write};
 use std::thread::sleep;
 use std::time::Duration;
 use fastdate::DateTime;
+use fast_log::plugin::packer::LogPacker;
 
-///pack by an date
-#[derive(Clone)]
-pub struct DateLogPacker {}
-
-impl Packer for DateLogPacker {
-    fn pack_name(&self) -> &'static str {
-        "log"
-    }
-
-    fn do_pack(&self, mut log_file: File, log_file_path: &str) -> Result<bool, LogError> {
-        impl DateLogPacker {
-            pub fn new_log_name(&self, first_file_path: &str, date: fastdate::DateTime) -> String {
-                let file_name = first_file_path.extract_file_name();
-                let mut new_log_name = date.to_string().replace(" ", "T").replace(":", "-");
-                new_log_name.push_str(".");
-                new_log_name.push_str(self.pack_name());
-                new_log_name =
-                    first_file_path.trim_end_matches(&file_name).to_string() + &new_log_name;
-                return new_log_name;
-            }
-        }
-        //do nothing,and not remove file
-        let now = DateTime::now();
-        let name = self.new_log_name(log_file_path, now);
-        let mut f = OpenOptions::new()
-            .write(true)
-            .read(true)
-            .append(true)
-            .open(&name);
-        if let Ok(mut f) = f {
-            //append to file
-            let mut data = vec![];
-            log_file.read_to_end(&mut data)?;
-            f.write_all(&data)?;
-            std::fs::remove_file(log_file_path)?;
-        } else {
-            //create file
-            f = OpenOptions::new().write(true).create(true).open(name);
-            if let Ok(mut f) = f {
-                let mut data = vec![];
-                log_file.read_to_end(&mut data)?;
-                f.write_all(&data)?;
-                std::fs::remove_file(log_file_path)?;
-            }
-        }
-        return Ok(false);
-    }
-}
 
 fn main() {
     //file_path also can use '"target/logs/test.log"'
     fast_log::init(Config::new().chan_len(Some(100000)).console().file_split(
         "target/logs/",
-        KeepType::KeepNum(2),
-        DateLogPacker {},
         PackType::ByDate(DateTime::now()),
+        KeepType::KeepNum(2),
+        LogPacker {},
     ))
         .unwrap();
-    for _ in 0..40000 {
+    for _ in 0..60 {
+        sleep(Duration::from_secs(1));
         log::info!("Commencing yak shaving");
     }
     log::logger().flush();
-    println!("you can see log files in path: {}", "target/logs/");
-    sleep(Duration::from_secs(3));
+    println!("you can see log files in path: {}", "target/logs/")
 }