DateTime: implements JsonSerializable, formats date in ISO 8601 forma…

…t accepted by JavaScript's Date object (BC break)

src/Utils/DateTime.php

@@ -18,7 +18,7 @@
  *
  * @author     David Grudl
  */
-class DateTime extends \DateTime
+class DateTime extends \DateTime implements \JsonSerializable
 {
 	/** minute in seconds */
 	const MINUTE = 60;
@@ -126,6 +126,16 @@ public static function createFromFormat($format, $time, $timezone = NULL)
 		return $date ? static::from($date) : FALSE;
 	}
 
+
+	/**
+	 * Returns JSON representation in ISO 8601 (used by JavaScript).
+	 * @return string
+	 */
+	public function jsonSerialize()
+	{
+		return $this->format('c');
+	}
+
 }
 
 });

tests/Utils/DateTime.JSON.phpt

@@ -0,0 +1,15 @@
+<?php
+
+/**
+ * Test: Nette\Utils\DateTime & JSON.
+ */
+
+use Tester\Assert,
+	Nette\Utils\DateTime;
+
+require __DIR__ . '/../bootstrap.php';
+
+
+date_default_timezone_set('Europe/Prague');
+
+Assert::same( '"1978-01-23T11:40:00+01:00"', json_encode(DateTime::from(254400000)) );