diff --git a/lib/dtimer.js b/lib/dtimer.js
index 4bd256a..066ac4c 100644
--- a/lib/dtimer.js
+++ b/lib/dtimer.js
@@ -209,7 +209,7 @@ DTimer.prototype.leave = function (cb) {
     .nodeify(cb);
 };
 
-DTimer.prototype.post = function (ev, delay, cb) {
+DTimer.prototype.post = function (ev, delay, opts, cb) {
     var self = this;
     var evId;
 
@@ -217,6 +217,17 @@ DTimer.prototype.post = function (ev, delay, cb) {
         throw new Error('delay argument must be of type number');
     }
 
+    // Parse the options
+    if (typeof opts === 'function') {
+        cb = opts;
+        opts = undefined;
+    }
+    if (opts === undefined) {
+        opts = {};
+    }
+    var updateTime = opts.updateTime == null ? true : opts.updateTime;
+    var updateMessage = opts.updateMessage == null ? true : opts.updateMessage;
+
     // Copy event.
     ev = JSON.parse(JSON.stringify(ev));
 
@@ -245,9 +256,15 @@ DTimer.prototype.post = function (ev, delay, cb) {
 
     return this._redisTime()
     .then(function (now) {
-        return self._pub.multi()
-        .zadd(self._keys.ei, now+delay, evId)
-        .hset(self._keys.ed, evId, msg)
+        var zaddArgs = [ self._keys.ei, now+delay, evId ];
+        if (!updateTime) {
+            zaddArgs.splice(1, 0, 'NX');
+        }
+        var multi = self._pub.multi()
+        return multi
+        .zadd.apply(multi, zaddArgs)
+        [updateMessage ? 'hset' : 'hsetnx'](self._keys.ed, evId, msg)
+        .hsetnx(self._keys.ed, evId, msg)
         .evalsha(
             scripts.update.sha,
             5,