diff -r 7a322e942c15 -r a82d385ec2c3 core/src/luan/modules/Thread.luan
--- a/core/src/luan/modules/Thread.luan	Fri May 20 18:35:20 2016 -0600
+++ b/core/src/luan/modules/Thread.luan	Mon May 23 16:16:03 2016 -0600
@@ -4,6 +4,7 @@
 local M = {}
 
 M.fork = ThreadLuan.fork
+M.schedule = ThreadLuan.schedule
 M.synchronized = ThreadLuan.synchronized_
 
 return M

diff -r 7a322e942c15 -r a82d385ec2c3 core/src/luan/modules/ThreadLuan.java
--- a/core/src/luan/modules/ThreadLuan.java	Fri May 20 18:35:20 2016 -0600
+++ b/core/src/luan/modules/ThreadLuan.java	Mon May 23 16:16:03 2016 -0600
@@ -1,7 +1,11 @@
 package luan.modules;
 
+import java.io.Closeable;
 import java.util.concurrent.Executor;
 import java.util.concurrent.Executors;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.ScheduledFuture;
+import java.util.concurrent.TimeUnit;
 import luan.Luan;
 import luan.LuanState;
 import luan.LuanFunction;
@@ -12,6 +16,7 @@
 
 public final class ThreadLuan {
 	private static final Executor exec = Executors.newCachedThreadPool();
+	private static final ScheduledExecutorService scheduler = Executors.newSingleThreadScheduledExecutor();
 
 	public static void fork(LuanState luan,LuanFunction fn,Object... args) {
 		DeepCloner cloner = new DeepCloner();
@@ -38,4 +43,29 @@
 		};
 	}
 
+	public static void schedule(LuanState luan,long delay,boolean repeat,LuanFunction fn,Object... args) {
+		DeepCloner cloner = new DeepCloner();
+		final LuanState newLuan = (LuanState)cloner.deepClone(luan);
+		final LuanFunction newFn = (LuanFunction)cloner.get(fn);
+		final Object[] newArgs = cloner.deepClone(args);
+		Runnable r = new Runnable(){public void run() {
+			try {
+				newFn.call(newLuan,newArgs);
+			} catch(LuanException e) {
+				e.printStackTrace();
+			}
+		}};
+		final ScheduledFuture sf;
+		if( repeat ) {
+			sf = scheduler.scheduleWithFixedDelay(r,delay,delay,TimeUnit.MILLISECONDS);
+		} else {
+			sf = scheduler.schedule(r,delay,TimeUnit.MILLISECONDS);
+		}
+		final Closeable c = new Closeable(){public void close(){
+			boolean b = sf.cancel(false);
+		}};
+		luan.registry().put(c,c);  // prevent gc
+		luan.onClose(c);
+	}
+
 }

diff -r 7a322e942c15 -r a82d385ec2c3 core/src/luan/modules/Time.luan
--- a/core/src/luan/modules/Time.luan	Fri May 20 18:35:20 2016 -0600
+++ b/core/src/luan/modules/Time.luan	Mon May 23 16:16:03 2016 -0600
@@ -54,12 +54,13 @@
 	return cal.getTimeInMillis()
 end
 
-function M.period( days, hours, minutes, seconds, millis )
+function M.period( t )
 	local cal = Calendar.getInstance()
 	cal.setTimeZone(TimeZone.getTimeZone("GMT"))
+	local days = t.days or 0
 	days = days + 1
-	cal.set( 1970, 0, days, hours or 0, minutes or 0, seconds or 0 )
-	cal.set( Calendar.MILLISECOND, millis or 0 )
+	cal.set( 1970, 0, days, t.hours or 0, t.minutes or 0, t.seconds or 0 )
+	cal.set( Calendar.MILLISECOND, t.millis or 0 )
 	return cal.getTimeInMillis()
 end