From 1e4b86d2284d49609068e803a5a0272822aff80e Mon Sep 17 00:00:00 2001
From: Avtandil Kikabidze <akalongman@gmail.com>
Date: Sat, 7 Apr 2018 03:50:12 +0400
Subject: [PATCH] Use ISO 8601 date constant

---
 src/Monolog/Formatter/ElasticSearchFormatter.php | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/Monolog/Formatter/ElasticSearchFormatter.php b/src/Monolog/Formatter/ElasticSearchFormatter.php
index 1ac9d2c7..56e4d2e4 100644
--- a/src/Monolog/Formatter/ElasticSearchFormatter.php
+++ b/src/Monolog/Formatter/ElasticSearchFormatter.php
@@ -11,6 +11,8 @@
 
 namespace Monolog\Formatter;
 
+use DateTime;
+
 /**
  * Format a log message into an ElasticSearch record
  *
@@ -35,7 +37,7 @@ class ElasticSearchFormatter extends NormalizerFormatter
     public function __construct($index, $type)
     {
         // ElasticSearch requires an ISO 8601 format date with optional millisecond precision.
-        parent::__construct('Y-m-d\TH:i:s.uP');
+        parent::__construct(DateTime::ISO8601);
 
         $this->index = $index;
         $this->type = $type;