diff --git a/dibi/dibi.php b/dibi/dibi.php
index a5301218..20b21444 100644
--- a/dibi/dibi.php
+++ b/dibi/dibi.php
@@ -527,8 +527,13 @@ class dibi
 	{
 		if ($time === NULL) {
 			$time = time(); // current time
+
 		} elseif (is_numeric($time)) {
 			$time = (int) $time; // timestamp
+
+		} elseif ($time instanceof DateTime) {
+			$time = $time->format('U');
+
 		} else {
 			$time = strtotime($time); // try convert to timestamp
 		}
diff --git a/dibi/libs/DibiProfiler.php b/dibi/libs/DibiProfiler.php
index ad70e60b..0de39caa 100644
--- a/dibi/libs/DibiProfiler.php
+++ b/dibi/libs/DibiProfiler.php
@@ -108,7 +108,7 @@ class DibiProfiler extends DibiObject implements IDibiProfiler
 		if (($event & $this->filter) === 0) return;
 
 		if ($event & self::QUERY) {
-			if ($this->useFirebug) {
+			if ($this->useFirebug && !headers_sent()) {
 				self::$table[] = array(
 					sprintf('%0.3f', dibi::$elapsedTime * 1000),
 					trim($sql),
diff --git a/dibi/libs/DibiTranslator.php b/dibi/libs/DibiTranslator.php
index cbed9e17..8429fe6d 100644
--- a/dibi/libs/DibiTranslator.php
+++ b/dibi/libs/DibiTranslator.php
@@ -307,7 +307,8 @@ final class DibiTranslator extends DibiObject
 
 			case 'd':  // date
 			case 't':  // datetime
-				return $this->driver->escape(is_numeric($value) ? (int) $value : strtotime($value), $modifier);
+				$value = is_numeric($value) ? (int) $value : ($value instanceof DateTime ? $value->format('U') : strtotime($value));
+				return $this->driver->escape($value, $modifier);
 
 			case 'by':
 			case 'n':  // identifier name