diff --git a/core/src/time.rs b/core/src/time.rs
index dcfe4e41..a57075b7 100644
--- a/core/src/time.rs
+++ b/core/src/time.rs
@@ -2,3 +2,4 @@
 
 pub use web_time::Duration;
 pub use web_time::Instant;
+pub use web_time::SystemTime;
diff --git a/debug/src/lib.rs b/debug/src/lib.rs
index 8d7aeba8..d04a7ac2 100644
--- a/debug/src/lib.rs
+++ b/debug/src/lib.rs
@@ -48,7 +48,7 @@ pub fn time(window: window::Id, name: impl AsRef<str>) -> Timer {
 
 #[cfg(feature = "enable")]
 mod internal {
-    use crate::core::time::Instant;
+    use crate::core::time::{Instant, SystemTime};
     use crate::core::window;
     use crate::style::theme;
 
@@ -104,6 +104,7 @@ mod internal {
         Timer {
             stage,
             start: Instant::now(),
+            start_system_time: SystemTime::now(),
         }
     }
 
@@ -111,12 +112,14 @@ mod internal {
     pub struct Timer {
         stage: timing::Stage,
         start: Instant,
+        start_system_time: SystemTime,
     }
 
     impl Timer {
         pub fn finish(self) {
             lock().sentinel.report_timing(Timing {
                 stage: self.stage,
+                start: self.start_system_time,
                 duration: self.start.elapsed(),
             });
         }
diff --git a/sentinel/src/client.rs b/sentinel/src/client.rs
index ec370088..8f7bfd65 100644
--- a/sentinel/src/client.rs
+++ b/sentinel/src/client.rs
@@ -1,3 +1,4 @@
+use crate::core::time::SystemTime;
 use crate::style::theme;
 use crate::{Input, Timing, SOCKET_ADDRESS};
 
@@ -13,7 +14,10 @@ pub struct Client {
 
 impl Client {
     pub fn report_theme_change(&mut self, palette: theme::Palette) {
-        let _ = self.sender.try_send(Input::ThemeChanged(palette));
+        let _ = self.sender.try_send(Input::ThemeChanged {
+            at: SystemTime::now(),
+            palette,
+        });
     }
 
     pub fn report_timing(&mut self, timing: Timing) {
@@ -38,7 +42,14 @@ async fn run(mut receiver: mpsc::Receiver<Input>) {
     loop {
         match _connect().await {
             Ok(mut stream) => {
-                let _ = send(&mut stream, Input::Connected(version)).await;
+                let _ = send(
+                    &mut stream,
+                    Input::Connected {
+                        at: SystemTime::now(),
+                        version,
+                    },
+                )
+                .await;
 
                 while let Some(input) = receiver.recv().await {
                     if send(&mut stream, input).await.is_err() {
diff --git a/sentinel/src/lib.rs b/sentinel/src/lib.rs
index 012d54ee..24fdc3c0 100644
--- a/sentinel/src/lib.rs
+++ b/sentinel/src/lib.rs
@@ -5,6 +5,7 @@ pub use semver::Version;
 pub mod client;
 pub mod timing;
 
+use crate::core::time::SystemTime;
 use crate::style::theme;
 use crate::timing::Timing;
 
@@ -18,17 +19,42 @@ pub const SOCKET_ADDRESS: &str = "127.0.0.1:9167";
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub enum Input {
-    Connected(Version),
+    Connected {
+        at: SystemTime,
+        version: Version,
+    },
+    ThemeChanged {
+        at: SystemTime,
+        palette: theme::Palette,
+    },
     TimingMeasured(Timing),
-    ThemeChanged(theme::Palette),
 }
 
 #[derive(Debug, Clone)]
 pub enum Event {
-    Connected(Version),
-    Disconnected,
+    Connected {
+        at: SystemTime,
+        version: Version,
+    },
+    Disconnected {
+        at: SystemTime,
+    },
+    ThemeChanged {
+        at: SystemTime,
+        palette: theme::Palette,
+    },
     TimingMeasured(Timing),
-    ThemeChanged(theme::Palette),
+}
+
+impl Event {
+    pub fn at(&self) -> SystemTime {
+        match self {
+            Self::Connected { at, .. }
+            | Self::Disconnected { at }
+            | Self::ThemeChanged { at, .. } => *at,
+            Self::TimingMeasured(timing) => timing.start,
+        }
+    }
 }
 
 pub fn run() -> impl Stream<Item = Event> {
@@ -48,12 +74,27 @@ pub fn run() -> impl Stream<Item = Event> {
                 Err(_error) => Some((None, State::Disconnected)),
             },
             State::Connected(stream) => match receive(stream).await {
-                Ok((_, Event::Disconnected)) | Err(_) => {
-                    Some((Some(Event::Disconnected), State::Disconnected))
-                }
-                Ok((stream, message)) => {
-                    Some((Some(message), State::Connected(stream)))
+                Ok((stream, input)) => {
+                    let event = match dbg!(input) {
+                        Input::Connected { at, version } => {
+                            Event::Connected { at, version }
+                        }
+                        Input::TimingMeasured(timing) => {
+                            Event::TimingMeasured(timing)
+                        }
+                        Input::ThemeChanged { at, palette } => {
+                            Event::ThemeChanged { at, palette }
+                        }
+                    };
+
+                    Some((Some(event), State::Connected(stream)))
                 }
+                Err(_) => Some((
+                    Some(Event::Disconnected {
+                        at: SystemTime::now(),
+                    }),
+                    State::Disconnected,
+                )),
             },
         }
     })
@@ -73,7 +114,7 @@ async fn connect() -> Result<net::TcpStream, io::Error> {
 
 async fn receive(
     mut stream: BufStream<net::TcpStream>,
-) -> Result<(BufStream<net::TcpStream>, Event), io::Error> {
+) -> Result<(BufStream<net::TcpStream>, Input), io::Error> {
     let mut bytes = Vec::new();
 
     loop {
@@ -87,21 +128,10 @@ async fn receive(
 
         match bincode::deserialize(&bytes) {
             Ok(input) => {
-                return Ok((
-                    stream,
-                    match dbg!(input) {
-                        Input::Connected(version) => Event::Connected(version),
-                        Input::TimingMeasured(timing) => {
-                            Event::TimingMeasured(timing)
-                        }
-                        Input::ThemeChanged(palette) => {
-                            Event::ThemeChanged(palette)
-                        }
-                    },
-                ));
+                return Ok((stream, input));
             }
             Err(_) => {
-                // TODO: Log decoding error
+                log::warn!("Error decoding sentinel message");
             }
         }
     }
diff --git a/sentinel/src/timing.rs b/sentinel/src/timing.rs
index 64ef561e..e10ce678 100644
--- a/sentinel/src/timing.rs
+++ b/sentinel/src/timing.rs
@@ -1,4 +1,4 @@
-use crate::core::time::Duration;
+use crate::core::time::{Duration, SystemTime};
 use crate::core::window;
 
 use serde::{Deserialize, Serialize};
@@ -8,6 +8,7 @@ use serde::{Deserialize, Serialize};
 )]
 pub struct Timing {
     pub stage: Stage,
+    pub start: SystemTime,
     pub duration: Duration,
 }