diff --git a/Cargo.toml b/Cargo.toml
index 80fc095..6f6917c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -35,8 +35,9 @@ name = "main"
 harness = false
 
 [features]
-default = ["task", "fs", "net"]
+default = ["task", "time", "fs", "net"]
 task = ["lb/task"]
+time = ["lb/time"]
 fs = ["lb/fs"]
 net = ["lb/net"]
 tokio-console = ["dep:console-subscriber"]
diff --git a/crates/lb/Cargo.toml b/crates/lb/Cargo.toml
index 2a0aabb..6d1837c 100644
--- a/crates/lb/Cargo.toml
+++ b/crates/lb/Cargo.toml
@@ -10,6 +10,7 @@ repository.workspace = true
 [features]
 runtime = ["tokio/rt"]
 task = ["tokio/rt", "tokio/time"]
+time = []
 fs = ["tokio/fs", "dep:walkdir", "dep:globset", "dep:tempfile"]
 net = ["tokio/net", "tokio/io-util"]
 
diff --git a/crates/lb/src/lib.rs b/crates/lb/src/lib.rs
index 975de0b..d119491 100644
--- a/crates/lb/src/lib.rs
+++ b/crates/lb/src/lib.rs
@@ -9,3 +9,5 @@ pub mod net;
 pub mod runtime;
 #[cfg(feature = "task")]
 pub mod task;
+#[cfg(feature = "time")]
+pub mod time;
diff --git a/crates/lb/src/time.rs b/crates/lb/src/time.rs
new file mode 100644
index 0000000..4f31d58
--- /dev/null
+++ b/crates/lb/src/time.rs
@@ -0,0 +1,30 @@
+use luaffi::{cdef, metatype};
+
+#[cdef(module = "lb:time")]
+pub struct lb_timelib;
+
+#[metatype]
+impl lb_timelib {
+    #[new]
+    extern "Lua-C" fn new() -> Self {
+        Self
+    }
+
+    pub extern "Lua-C" fn instant() -> lb_instant {
+        lb_instant::new(std::time::Instant::now())
+    }
+}
+
+#[cdef]
+pub struct lb_instant(#[opaque] std::time::Instant);
+
+#[metatype]
+impl lb_instant {
+    fn new(instant: std::time::Instant) -> Self {
+        Self(instant)
+    }
+
+    pub extern "Lua-C" fn elapsed(&self) -> f64 {
+        self.0.elapsed().as_secs_f64()
+    }
+}
diff --git a/src/lib.rs b/src/lib.rs
index 06eb7b9..1f7486d 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -6,6 +6,8 @@ pub use lb::fs;
 pub use lb::net;
 #[cfg(feature = "task")]
 pub use lb::task;
+#[cfg(feature = "time")]
+pub use lb::time;
 
 #[doc(hidden)]
 pub fn open(#[allow(unused)] rt: &mut lb::runtime::Builder) {
@@ -13,6 +15,8 @@ pub fn open(#[allow(unused)] rt: &mut lb::runtime::Builder) {
     rt.module::<task::lb_tasklib>();
     #[cfg(feature = "task")]
     rt.module::<chan::lb_chanlib>();
+    #[cfg(feature = "time")]
+    rt.module::<time::lb_timelib>();
     #[cfg(feature = "fs")]
     rt.module::<fs::lb_fslib>();
     #[cfg(feature = "net")]
diff --git a/tests/main.lua b/tests/main.lua
index 61c0ab4..8fc1db9 100644
--- a/tests/main.lua
+++ b/tests/main.lua
@@ -1,25 +1,27 @@
 if (...) ~= nil and (...).type == "group" then return end -- prevent recursive harness call
 
 local ok = pcall(require, "lb:task")
-if not ok then error("lua test harness requires lb:task module") end
+if not ok then error("lua test harness requires 'lb:task'") end
+local ok, time = pcall(require, "lb:time")
+if not ok then error("lua test harness requires 'lb:time'") end
 local ok, fs = pcall(require, "lb:fs")
-if not ok then error("lua test harness requires lb:fs module") end
+if not ok then error("lua test harness requires 'lb:fs'") end
 
 local global = _G
-local colors = {
+local color = {
   reset = "\x1b[0m",
   pass = "\x1b[32;1m", -- green
   fail = "\x1b[31;1m", -- red
 }
 
-local icons = {
+local icon = {
   check = "\u{2713}",
   cross = "\u{00d7}",
   chevron = "\u{203a}",
 }
 
 local function style(name, s)
-  return ("%s%s%s"):format(colors[name], s, colors.reset)
+  return ("%s%s%s"):format(color[name], s, color.reset)
 end
 
 local function create_test(name, f, group)
@@ -54,7 +56,7 @@ local function name_test(test)
   local name = test.name
   local group = test.group
   while group ~= nil do
-    if group.name ~= "" then name = ("%s %s %s"):format(group.name, icons.chevron, name) end
+    if group.name ~= "" then name = ("%s %s %s"):format(group.name, icon.chevron, name) end
     group = group.parent
   end
   return name
@@ -106,7 +108,7 @@ end
 
 local function main(item)
   local cx = { tasks = {} }
-  local time, pass, fail = os.clock(), 0, 0
+  local time, pass, fail = time.instant(), 0, 0
   start(cx, item)
   for _, task in ipairs(cx.tasks) do
     if task:await().state == "pass" then
@@ -115,21 +117,25 @@ local function main(item)
       fail = fail + 1
     end
   end
-  local time = (os.clock() - time) * 1000
+  local elapsed = time:elapsed()
   local code = 1
   if fail == 0 then
-    print("", style("pass", ("%s %d tests passed"):format(icons.check, pass)))
+    print("", style("pass", ("%s %d tests passed"):format(icon.check, pass)))
     code = 0
   else
     print(
       "",
       ("%s, %s"):format(
-        style("pass", ("%s %d tests passed"):format(icons.check, pass)),
-        style("fail", ("%s %d tests failed"):format(icons.cross, fail))
+        style("pass", ("%s %d tests passed"):format(icon.check, pass)),
+        style("fail", ("%s %d tests failed"):format(icon.cross, fail))
       )
     )
   end
-  print("", ("%s completed in %d ms"):format(icons.chevron, time))
+  if elapsed < 1000 then
+    print("", ("%s completed in %.2f ms"):format(icon.chevron, elapsed * 1000))
+  else
+    print("", ("%s completed in %.2f s"):format(icon.chevron, elapsed))
+  end
   cx = nil
   collectgarbage()
   check_refs()