diff --git a/sdgb-cli/src/commands.rs b/sdgb-cli/src/commands.rs
index 68aefca..4122fb2 100644
--- a/sdgb-cli/src/commands.rs
+++ b/sdgb-cli/src/commands.rs
@@ -31,11 +31,14 @@ pub enum Commands {
         variant: AuthLiteVariant,
     },
 
+    // below are login-free
     Ping,
     Preview {
         #[arg(short, long)]
         user_id: u32,
     },
+
+    // below requires login
     Userdata {
         #[arg(short, long)]
         user_id: u32,
@@ -52,5 +55,12 @@ pub enum Commands {
     Logout {
         #[arg(short, long)]
         user_id: u32,
+        /// Second-precision login unix timestamp, must be the same as on `login`
+        ///
+        /// For official arcades, it's commonly the time `amdaemon.exe` starts
+        ///
+        /// For unofficial clients, it depends.
+        #[arg(short, long)]
+        timestamp: u64,
     },
 }
diff --git a/sdgb-cli/src/main.rs b/sdgb-cli/src/main.rs
index 99f5005..f0f93dc 100644
--- a/sdgb-cli/src/main.rs
+++ b/sdgb-cli/src/main.rs
@@ -54,13 +54,14 @@ async fn main() -> Result<(), Box<dyn snafu::Error>> {
 
     // TODO: refactor via enum_dispatch
     match command {
-        commands::Commands::Logout { user_id } => {
+        commands::Commands::Logout { user_id, timestamp } => {
             let logout: UserLogoutApiResp = Sdgb1_50::request(
                 &client,
                 APIMethod::UserLogoutApi,
                 user_id,
                 UserLogoutApi {
                     user_id,
+                    date_time: timestamp,
                     ..Default::default()
                 },
             )