From 8c3ce9ae35f0a7a7de47e4cbac2ad71de9897d2d Mon Sep 17 00:00:00 2001
From: Stefan <stefan@gorules.io>
Date: Fri, 4 Jul 2025 02:33:55 +0200
Subject: [PATCH] fix: timezone caching

---
 core/expression/src/vm/date/mod.rs | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/core/expression/src/vm/date/mod.rs b/core/expression/src/vm/date/mod.rs
index 88a72c24..99355b75 100644
--- a/core/expression/src/vm/date/mod.rs
+++ b/core/expression/src/vm/date/mod.rs
@@ -185,12 +185,17 @@ mod helper {
     use rust_decimal::prelude::ToPrimitive;
     use std::ops::{Add, Deref};
     use std::str::FromStr;
+    use std::sync::OnceLock;
 
     fn tz() -> Tz {
-        iana_time_zone::get_timezone()
-            .ok()
-            .and_then(|tz| Tz::from_str(&tz).ok())
-            .unwrap_or_else(|| Tz::UTC)
+        static CACHED_TZ: OnceLock<Tz> = OnceLock::new();
+
+        *CACHED_TZ.get_or_init(|| {
+            iana_time_zone::get_timezone()
+                .ok()
+                .and_then(|tz| Tz::from_str(&tz).ok())
+                .unwrap_or_else(|| Tz::UTC)
+        })
     }
 
     pub fn now() -> DateTime<Tz> {