1 files changed, 17 insertions, 3 deletions
diff --git a/src/Monolog/Processor/PsrLogMessageProcessor.php b/src/Monolog/Processor/PsrLogMessageProcessor.php
index c2686ce..8078403 100644
--- a/src/Monolog/Processor/PsrLogMessageProcessor.php
+++ b/src/Monolog/Processor/PsrLogMessageProcessor.php
@@ -1,4 +1,4 @@
-<?php
+<?php declare(strict_types=1);
 
 /*
  * This file is part of the Monolog package.
@@ -20,20 +20,34 @@ namespace Monolog\Processor;
  */
 class PsrLogMessageProcessor
 {
+    const SIMPLE_DATE = "Y-m-d\TH:i:sP";
+
+    private $dateFormat;
+
+    /**
+     * @param string $dateFormat The format of the timestamp: one supported by DateTime::format
+     */
+    public function __construct(string $dateFormat = null)
+    {
+        $this->dateFormat = null === $dateFormat ? static::SIMPLE_DATE : $dateFormat;
+    }
+
     /**
      * @param  array $record
      * @return array
      */
-    public function __invoke(array $record)
+    public function __invoke(array $record): array
     {
         if (false === strpos($record['message'], '{')) {
             return $record;
         }
 
-        $replacements = array();
+        $replacements = [];
         foreach ($record['context'] as $key => $val) {
             if (is_null($val) || is_scalar($val) || (is_object($val) && method_exists($val, "__toString"))) {
                 $replacements['{'.$key.'}'] = $val;
+            } elseif ($val instanceof \DateTimeInterface) {
+                $replacements['{'.$key.'}'] = $val->format($this->dateFormat);
             } elseif (is_object($val)) {
                 $replacements['{'.$key.'}'] = '[object '.get_class($val).']';
             } else {