diff --git a/phpBB/feed.php b/phpBB/feed.php
index b8c0c370f9..d7092d6758 100644
--- a/phpBB/feed.php
+++ b/phpBB/feed.php
@@ -255,7 +255,7 @@ function feed_format_date($time)
 	{
 		global $user;
 
-		$zone_offset = (int) $user->timezone + (int) $user->dst;
+		$zone_offset = $user->create_datetime()->getOffset();
 
 		$sign = ($zone_offset < 0) ? '-' : '+';
 		$time_offset = abs($zone_offset);
diff --git a/phpBB/includes/functions_profile_fields.php b/phpBB/includes/functions_profile_fields.php
index ec29a1732d..aacfa82c54 100644
--- a/phpBB/includes/functions_profile_fields.php
+++ b/phpBB/includes/functions_profile_fields.php
@@ -555,9 +555,12 @@ class custom_profile
 				else if ($day && $month && $year)
 				{
 					global $user;
-					// Date should display as the same date for every user regardless of timezone, so remove offset
-					// to compensate for the offset added by user::format_date()
-					return $user->format_date(gmmktime(0, 0, 0, $month, $day, $year) - ($user->timezone + $user->dst), $user->lang['DATE_FORMAT'], true);
+					// Date should display as the same date for every user regardless of timezone
+
+					return $user->create_datetime()
+						->setDate($year, $month, $day)
+						->setTime(0, 0, 0)
+						->format($user->lang['DATE_FORMAT'], true);
 				}
 
 				return $value;
diff --git a/phpBB/index.php b/phpBB/index.php
index 182efbc7e0..ccefd9833c 100644
--- a/phpBB/index.php
+++ b/phpBB/index.php
@@ -84,11 +84,12 @@ $legend = implode(', ', $legend);
 $birthday_list = array();
 if ($config['load_birthdays'] && $config['allow_birthdays'] && $auth->acl_gets('u_viewprofile', 'a_user', 'a_useradd', 'a_userdel'))
 {
-	$now = phpbb_gmgetdate(time() + $user->timezone + $user->dst);
+	$time = $user->create_datetime();
+	$now = phpbb_gmgetdate($time->getTimestamp() + $time->getOffset());
 
 	// Display birthdays of 29th february on 28th february in non-leap-years
 	$leap_year_birthdays = '';
-	if ($now['mday'] == 28 && $now['mon'] == 2 && !$user->format_date(time(), 'L'))
+	if ($now['mday'] == 28 && $now['mon'] == 2 && !$time->format('L'))
 	{
 		$leap_year_birthdays = " OR user_birthday LIKE '" . $db->sql_escape(sprintf('%2d-%2d-', 29, 2)) . "%'";
 	}
diff --git a/phpBB/memberlist.php b/phpBB/memberlist.php
index 556db2fa5d..ea8a6fc44b 100644
--- a/phpBB/memberlist.php
+++ b/phpBB/memberlist.php
@@ -1684,7 +1684,8 @@ function show_profile($data, $user_notes_enabled = false, $warn_user_enabled = f
 
 		if ($bday_year)
 		{
-			$now = phpbb_gmgetdate(time() + $user->timezone + $user->dst);
+			$now = $user->create_datetime();
+			$now = phpbb_gmgetdate($now->getTimestamp() + $now->getOffset());
 
 			$diff = $now['mon'] - $bday_month;
 			if ($diff == 0)
diff --git a/phpBB/viewtopic.php b/phpBB/viewtopic.php
index e78ba73cd7..782f02fd4b 100644
--- a/phpBB/viewtopic.php
+++ b/phpBB/viewtopic.php
@@ -965,7 +965,8 @@ $sql_ary = array(
 $sql = $db->sql_build_query('SELECT', $sql_ary);
 $result = $db->sql_query($sql);
 
-$now = phpbb_gmgetdate(time() + $user->timezone + $user->dst);
+$now = $user->create_datetime();
+$now = phpbb_gmgetdate($now->getTimestamp() + $now->getOffset());
 
 // Posts are stored in the $rowset array while $attach_list, $user_cache
 // and the global bbcode_bitfield are built