diff --git a/zircon-loader/src/lib.rs b/zircon-loader/src/lib.rs
index 4a5ff45aa..40f6a4626 100644
--- a/zircon-loader/src/lib.rs
+++ b/zircon-loader/src/lib.rs
@@ -192,7 +192,10 @@ fn spawn(thread: Arc<Thread>) {
             let mut cx = thread.wait_for_run().await;
             trace!("go to user: {:#x?}", cx);
             debug!("switch to {}|{}", thread.proc().name(), thread.name());
+            let tmp_time = kernel_hal::timer_now().as_nanos();
             kernel_hal::context_run(&mut cx);
+            let time = kernel_hal::timer_now().as_nanos() - tmp_time;
+            thread.time_add(time);
             trace!("back from user: {:#x?}", cx);
             EXCEPTIONS_USER.add(1);
             let mut exit = false;
diff --git a/zircon-object/src/task/thread.rs b/zircon-object/src/task/thread.rs
index 437eb3c12..539c69f7c 100644
--- a/zircon-object/src/task/thread.rs
+++ b/zircon-object/src/task/thread.rs
@@ -116,6 +116,8 @@ struct ThreadInner {
     /// NOTE: This variable will never be `Suspended`. On suspended, the
     /// `suspend_count` is non-zero, and this represents the state before suspended.
     state: ThreadState,
+    /// The time this thread has run on cpu
+    time: u128,
 }
 
 impl Thread {
@@ -345,6 +347,14 @@ impl Thread {
     pub fn get_exceptionate(&self) -> Arc<Exceptionate> {
         self.exceptionate.clone()
     }
+
+    pub fn time_add(&self, time: u128) {
+        self.inner.lock().time += time;
+    }
+
+    pub fn get_time(&self) -> u64 {
+        self.inner.lock().time as u64
+    }
 }
 
 pub trait IntoResult<T> {
diff --git a/zircon-syscall/src/time.rs b/zircon-syscall/src/time.rs
index 4e608f245..619d13081 100644
--- a/zircon-syscall/src/time.rs
+++ b/zircon-syscall/src/time.rs
@@ -27,7 +27,10 @@ impl Syscall<'_> {
                 time.write(timer_now().as_nanos() as u64 + UTC_OFFSET.load(Ordering::Relaxed))?;
                 Ok(())
             }
-            ZX_CLOCK_THREAD => unimplemented!(),
+            ZX_CLOCK_THREAD => {
+                time.write(self.thread.get_time())?;
+                Ok(())
+            }
             _ => Err(ZxError::NOT_SUPPORTED),
         }
     }