diff --git a/litellm_dashboard.py b/litellm_dashboard.py
index d092910..a32c033 100644
--- a/litellm_dashboard.py
+++ b/litellm_dashboard.py
@@ -5,12 +5,13 @@ author_url: https://rin.captcouch.xyz
 description: Check LiteLLM proxy health + auth status and get cost breakdowns with configurable timerange. Two functions, that's it.
 required_open_webui_version: 0.4.0
 requirements: requests
-version: 1.2.1
+version: 1.2.2
 licence: MIT
 """
 
 import requests
 from datetime import datetime, timedelta
+from zoneinfo import ZoneInfo
 from pydantic import BaseModel, Field
 from typing import Optional
 
@@ -34,9 +35,9 @@ class Tools:
             default=True,
             description="Default behavior for zero-spend model filtering. When True, models with sub-$0.001 spend are hidden by default and summarized. The per-call hide_zero_spend parameter can override this.",
         )
-        timezone_offset: int = Field(
-            default=0,
-            description="Timezone offset from UTC in hours (e.g. -4 for EDT, -5 for EST). Used for natural language date resolution (today, yesterday).",
+        timezone: str = Field(
+            default="UTC",
+            description="IANA Timezone name (e.g. America/New_York, Europe/London, Asia/Tokyo). Used for natural language date resolution (today, yesterday).",
         )
 
     def _headers(self) -> dict:
@@ -58,8 +59,12 @@ class Tools:
         Falls back to passthrough if already YYYY-MM-DD or unrecognized.
         """
         date_str = date_str.strip().lower()
-        # Apply timezone offset to UTC now to get "local" today
-        today = (datetime.utcnow() + timedelta(hours=self.valves.timezone_offset)).date()
+        # Resolve "today" in the configured timezone
+        try:
+            today = datetime.now(ZoneInfo(self.valves.timezone)).date()
+        except Exception:
+            # Fallback to UTC if timezone is invalid
+            today = datetime.utcnow().date()
 
         # Direct shortcuts
         if date_str == "today":