From 7953531802bb28c9d1e28578645e64706b728ea3 Mon Sep 17 00:00:00 2001
From: Bryan Nielsen <bryan@packettide.com>
Date: Fri, 9 Aug 2024 11:03:00 -0400
Subject: [PATCH] Added timezone argument to GraphQL FormattableDate type

---
 CHANGELOG.md                             |  4 ++++
 src/Api/Graph/Fields/FormattableDate.php | 15 +++++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6db8165..523bcaa 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+### Added
+
+- Timezone argument for GraphQL FormattableDate types
+
 ### Fixed
 
 - Bug where integer dates were not handled properly when used as a GraphQL FormattableDate
diff --git a/src/Api/Graph/Fields/FormattableDate.php b/src/Api/Graph/Fields/FormattableDate.php
index f76b96a..48ed00f 100644
--- a/src/Api/Graph/Fields/FormattableDate.php
+++ b/src/Api/Graph/Fields/FormattableDate.php
@@ -33,6 +33,11 @@ public function args(): array
                 'type' => Type::boolean(),
                 'defaultValue' => false,
             ],
+            'timezone' => [
+                'type' => Type::string(),
+                'defaultValue' => null,
+                'description' => 'Timezone defaults to UTC. Use "SYSTEM" for the value set in ExpressionEngine',
+            ],
         ];
     }
 
@@ -48,6 +53,16 @@ protected function resolve($root, array $args): ?string
             return null;
         }
 
+        if ($args['timezone']) {
+            if ($args['timezone'] === 'SYSTEM') {
+                $args['timezone'] = ee()->config->item('default_site_timezone') ?: date_default_timezone_get();
+            }
+
+            if (in_array($args['timezone'], \DateTimeZone::listIdentifiers())) {
+                $date->setTimezone($args['timezone']);
+            }
+        }
+
         if ($args['relative']) {
             return $date->diffForHumans();
         }