diff --git a/NEWS b/NEWS
index f7381ce23e0..43aacb34015 100644
--- a/NEWS
+++ b/NEWS
@@ -54,6 +54,8 @@ PHP                                                                        NEWS
   multipliers). (Ilia)
 - Fixed bug #39787 (PHP doesn't work with Apache 2.3). (mv at binarysec dot
   com).
+- Fixed bug #39782 (setTime() on a DateTime constructed with a Weekday
+  yields incorrect results). (Ilia)
 - Fixed bug #39780 (PNG image with CRC/data error raises fatal error) (Pierre)
 - Fixed bug #39775 ("Indirect modification ..." message is not shown). (Dmitry)
 - Fixed bug #39763 (magic quotes are applied twice by ext/filter in
diff --git a/ext/date/php_date.c b/ext/date/php_date.c
index c5502daf2e4..07dc3ecf6c5 100644
--- a/ext/date/php_date.c
+++ b/ext/date/php_date.c
@@ -1643,6 +1643,8 @@ static void date_initialize(php_date_obj *dateobj, /*const*/ char *time_str, int
 	timelib_fill_holes(dateobj->time, now, 0);
 	timelib_update_ts(dateobj->time, tzi);
 
+	dateobj->time->have_weekday_relative = dateobj->time->have_relative = 0;
+
 	if (now->tz_info != tzi) {
 		timelib_tzinfo_dtor(now->tz_info);
 	}
diff --git a/ext/date/tests/bug39782.phpt b/ext/date/tests/bug39782.phpt
new file mode 100644
index 00000000000..99abdd7bc84
--- /dev/null
+++ b/ext/date/tests/bug39782.phpt
@@ -0,0 +1,19 @@
+--TEST--
+Bug #39782 (setTime() on a DateTime constructed with a Weekday yields incorrect results)
+--FILE--
+<?php
+date_default_timezone_set("GMT");
+
+$dttTest = new DateTime('Dec 10 2006 Next Wednesday');
+echo $dttTest->format('D M j Y - H:i:s') . "\n";
+
+$dttTest->setTime(12, 0, 0);
+echo $dttTest->format('D M j Y - H:i:s') . "\n";
+
+$dttTest->setTime(12, 0, 0);
+echo $dttTest->format('D M j Y - H:i:s') . "\n";
+?>
+--EXPECT--
+Wed Dec 13 2006 - 00:00:00
+Wed Dec 13 2006 - 12:00:00
+Wed Dec 13 2006 - 12:00:00
\ No newline at end of file