diff --git a/onvif/examples/camera.rs b/onvif/examples/camera.rs
index 2d6cb68..883601c 100644
--- a/onvif/examples/camera.rs
+++ b/onvif/examples/camera.rs
@@ -1,7 +1,8 @@
-use onvif::soap;
+use chrono::{NaiveDate, Utc};
+use onvif::soap::{self, client::AuthType};
 use schema::{self, transport};
 use structopt::StructOpt;
-use tracing::debug;
+use tracing::{debug, warn};
 use url::Url;
 
 #[derive(StructOpt)]
@@ -24,6 +25,14 @@ struct Args {
     #[structopt(global = true, long, default_value = "onvif/device_service")]
     service_path: String,
 
+    /// Auto fix time gap between PC and the camera
+    #[structopt(short = "t", long)]
+    fix_time: bool,
+
+    /// Authorization type [Any(Default), Digest, UsernameToken]
+    #[structopt(short = "a", long, default_value = "Any")]
+    auth_type: String,
+
     #[structopt(subcommand)]
     cmd: Cmd,
 }
@@ -92,9 +101,15 @@ impl Clients {
             .as_ref()
             .ok_or_else(|| "--uri must be specified.".to_string())?;
         let devicemgmt_uri = base_uri.join(&args.service_path).unwrap();
+        let auth_type = match args.auth_type.to_ascii_lowercase().as_str() {
+            "digest" => AuthType::Digest,
+            "usernametoken" => AuthType::UsernameToken,
+            _ => AuthType::Any,
+        };
         let mut out = Self {
             devicemgmt: soap::client::ClientBuilder::new(&devicemgmt_uri)
                 .credentials(creds.clone())
+                .auth_type(auth_type.clone())
                 .build(),
             imaging: None,
             ptz: None,
@@ -104,6 +119,36 @@ impl Clients {
             media2: None,
             analytics: None,
         };
+
+        let time_gap = if args.fix_time {
+            let device_time =
+                schema::devicemgmt::get_system_date_and_time(&out.devicemgmt, &Default::default())
+                    .await?
+                    .system_date_and_time;
+
+            if let Some(utc_time) = &device_time.utc_date_time {
+                let pc_time = Utc::now();
+                let date = &utc_time.date;
+                let t = &utc_time.time;
+                let device_time =
+                    NaiveDate::from_ymd_opt(date.year, date.month as _, date.day as _)
+                        .unwrap()
+                        .and_hms_opt(t.hour as _, t.minute as _, t.second as _)
+                        .unwrap()
+                        .and_utc();
+
+                let diff = device_time - pc_time;
+                if diff.num_seconds().abs() > 60 {
+                    out.devicemgmt.set_fix_time_gap(Some(diff));
+                }
+                Some(diff)
+            } else {
+                warn!("GetSystemDateAndTimeResponse doesn't have utc_data_time value!");
+                None
+            }
+        } else {
+            None
+        };
         let services =
             schema::devicemgmt::get_services(&out.devicemgmt, &Default::default()).await?;
         for service in &services.service {
@@ -117,6 +162,8 @@ impl Clients {
             let svc = Some(
                 soap::client::ClientBuilder::new(&service_url)
                     .credentials(creds.clone())
+                    .auth_type(auth_type.clone())
+                    .fix_time_gap(time_gap)
                     .build(),
             );
             match service.namespace.as_str() {
diff --git a/onvif/src/discovery/mod.rs b/onvif/src/discovery/mod.rs
index c299adb..b224aba 100644
--- a/onvif/src/discovery/mod.rs
+++ b/onvif/src/discovery/mod.rs
@@ -481,7 +481,7 @@ mod tests {
         let our_uuid = "uuid:84ede3de-7dec-11d0-c360-F01234567890";
         let bad_uuid = "uuid:84ede3de-7dec-11d0-c360-F00000000000";
 
-        let input = vec![
+        let input = [
             make_xml(our_uuid, "http://addr_20 http://addr_21 http://addr_22"),
             make_xml(bad_uuid, "http://addr_30 http://addr_31"),
         ];
diff --git a/onvif/src/soap/auth/username_token.rs b/onvif/src/soap/auth/username_token.rs
index a2622bf..8329df9 100644
--- a/onvif/src/soap/auth/username_token.rs
+++ b/onvif/src/soap/auth/username_token.rs
@@ -7,10 +7,22 @@ pub struct UsernameToken {
 }
 
 impl UsernameToken {
-    pub fn new(username: &str, password: &str) -> UsernameToken {
+    pub fn new(
+        username: &str,
+        password: &str,
+        fix_time_gap: Option<chrono::Duration>,
+    ) -> UsernameToken {
         let uuid = uuid::Uuid::new_v4();
         let nonce = uuid.as_bytes();
-        let created = chrono::Utc::now().to_rfc3339_opts(chrono::SecondsFormat::Millis, true);
+
+        let mut created = chrono::Utc::now();
+        if let Some(time_gap) = fix_time_gap {
+            created = match created.checked_add_signed(time_gap) {
+                Some(t) => t,
+                None => chrono::Utc::now(),
+            };
+        }
+        let created = created.to_rfc3339_opts(chrono::SecondsFormat::Millis, true);
 
         let mut concat = Vec::with_capacity(nonce.len() + created.len() + password.len());
 
diff --git a/onvif/src/soap/client.rs b/onvif/src/soap/client.rs
index cc9b179..f8d2dc7 100644
--- a/onvif/src/soap/client.rs
+++ b/onvif/src/soap/client.rs
@@ -50,6 +50,7 @@ impl ClientBuilder {
                 response_patcher: None,
                 auth_type: AuthType::Any,
                 timeout: ClientBuilder::DEFAULT_TIMEOUT,
+                fix_time_gap: None,
             },
         }
     }
@@ -79,6 +80,11 @@ impl ClientBuilder {
         self
     }
 
+    pub fn fix_time_gap(mut self, time_gap: Option<chrono::Duration>) -> Self {
+        self.config.fix_time_gap = time_gap;
+        self
+    }
+
     pub fn build(self) -> Client {
         let client = if let Some(client) = self.client {
             client
@@ -121,6 +127,7 @@ struct Config {
     response_patcher: Option<ResponsePatcher>,
     auth_type: AuthType,
     timeout: Duration,
+    fix_time_gap: Option<chrono::Duration>,
 }
 
 #[derive(Clone, Debug)]
@@ -314,6 +321,10 @@ impl Client {
         self.config
             .credentials
             .as_ref()
-            .map(|c| UsernameToken::new(&c.username, &c.password))
+            .map(|c| UsernameToken::new(&c.username, &c.password, self.config.fix_time_gap))
+    }
+
+    pub fn set_fix_time_gap(&mut self, time_gap: Option<chrono::Duration>) {
+        self.config.fix_time_gap = time_gap;
     }
 }