Added a test case for (docs) bug #74652

Author: derickr

ext/date/tests/bug74652.phpt

@@ -0,0 +1,30 @@
+--TEST--
+Test for bug #74652: Incomplete dates
+--INI--
+date.timezone=UTC
+--FILE--
+<?php
+$formats = [
+	'2017-03-25 10:52:09',
+	'2017-03-25 10:52',
+	'2017-03-25 10am',
+	'2017-03-25',
+	'2017-03',
+	'2017.042',
+	'2017043',
+];
+
+foreach ( $formats as $format )
+{
+	$dt = new DateTimeImmutable( $format );
+	echo $dt->format( 'Y-m-d H:i:s' ), "\n";
+}
+?>
+--EXPECT--
+2017-03-25 10:52:09
+2017-03-25 10:52:00
+2017-03-25 10:00:00
+2017-03-25 00:00:00
+2017-03-01 00:00:00
+2017-02-11 00:00:00
+2017-02-12 00:00:00