From b78741a5647e830dd54bd241a7c579399c292378 Mon Sep 17 00:00:00 2001
From: Ryan Cramer <ryan@processwire.com>
Date: Fri, 10 Dec 2021 10:54:25 -0500
Subject: [PATCH] Fix issue processwire/processwire-issues#1483

---
 wire/core/WireDateTime.php | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/wire/core/WireDateTime.php b/wire/core/WireDateTime.php
index d748e7fc..09611a8e 100644
--- a/wire/core/WireDateTime.php
+++ b/wire/core/WireDateTime.php
@@ -446,7 +446,8 @@ class WireDateTime extends Wire {
 			$test = trim(preg_replace('/[^\d]/', '', $str), '0');
 			if(!strlen($test)) return $options['emptyReturnValue'];
 		}
-		return strtotime($str, $options['baseTimestamp']); 
+		if($options['baseTimestamp'] === null) return strtotime($str);
+		return strtotime($str, $options['baseTimestamp']) ;
 	}