diff --git a/dibi/libs/DibiResult.php b/dibi/libs/DibiResult.php
index be016051..10a7944c 100644
--- a/dibi/libs/DibiResult.php
+++ b/dibi/libs/DibiResult.php
@@ -493,7 +493,10 @@ class DibiResult extends DibiObject implements IDataSource
 
 	/**
 	 * Converts value to specified type and format.
-	 * @return array  ($type, $format)
+	 * @param  mixed  value
+	 * @param  int    type
+	 * @param  string format
+	 * @return mixed
 	 */
 	final public function convert($value, $type, $format = NULL)
 	{
diff --git a/dibi/libs/DibiRow.php b/dibi/libs/DibiRow.php
index fcdd5a8a..78fff7b3 100644
--- a/dibi/libs/DibiRow.php
+++ b/dibi/libs/DibiRow.php
@@ -40,6 +40,44 @@ class DibiRow extends ArrayObject
 
 
 
+	/**
+	 * Converts value to date-time format.
+	 * @param  string key
+	 * @param  string format
+	 * @return mixed
+	 */
+	public function asDate($key, $format = NULL)
+	{
+		$value = $this[$key];
+		if ($value === NULL || $value === FALSE) {
+			return $value;
+
+		} else {
+			$value = is_numeric($value) ? (int) $value : strtotime($value);
+			return $format === NULL ? $value : date($format, $value);
+		}
+	}
+
+
+
+	/**
+	 * Converts value to boolean.
+	 * @param  string key
+	 * @return mixed
+	 */
+	public function asBool($key)
+	{
+		$value = $this[$key];
+		if ($value === NULL || $value === FALSE) {
+			return $value;
+
+		} else {
+			return ((bool) $value) && $value !== 'f' && $value !== 'F';
+		}
+	}
+
+
+
 	/**
 	 * PHP < 5.3 workaround
 	 * @return void
diff --git a/dibi/libs/DibiTranslator.php b/dibi/libs/DibiTranslator.php
index b06b6d64..6bb16f24 100644
--- a/dibi/libs/DibiTranslator.php
+++ b/dibi/libs/DibiTranslator.php
@@ -319,6 +319,10 @@ final class DibiTranslator extends DibiObject
 			case 'sn': // string or NULL
 				return $value == '' ? 'NULL' : $this->driver->escape($value, dibi::TEXT); // notice two equal signs
 
+			case 'in': // signed int or NULL
+				if ($value == '') $value = NULL;
+				// intentionally break omitted
+
 			case 'i':  // signed int
 			case 'u':  // unsigned int, ignored
 				// support for long numbers - keep them unchanged