From b1e1027160f30acedc53d413d2b35b4e72ee43f6 Mon Sep 17 00:00:00 2001
From: Daniel <dsun@coastpay.com>
Date: Tue, 16 Apr 2024 11:42:42 +1000
Subject: [PATCH] fix formatInTimeZone incorrectly interpreting the input date
 string

* fixing https://github.com/marnusw/date-fns-tz/issues/279
---
 src/formatInTimeZone/index.ts | 2 +-
 src/formatInTimeZone/test.js  | 4 ++++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/formatInTimeZone/index.ts b/src/formatInTimeZone/index.ts
index fb19a23..dc83477 100644
--- a/src/formatInTimeZone/index.ts
+++ b/src/formatInTimeZone/index.ts
@@ -34,5 +34,5 @@ export function formatInTimeZone(
     timeZone,
     originalDate: date,
   }
-  return format(toZonedTime(date, timeZone), formatStr, options)
+  return format(toZonedTime(date, timeZone, { timeZone: options.timeZone }), formatStr, options)
 }
diff --git a/src/formatInTimeZone/test.js b/src/formatInTimeZone/test.js
index ff92392..2e0bcb3 100644
--- a/src/formatInTimeZone/test.js
+++ b/src/formatInTimeZone/test.js
@@ -3,6 +3,10 @@ import { enGB } from 'date-fns/locale/en-GB'
 import { formatInTimeZone } from './index.js'
 
 describe('formatInTimeZone', function () {
+  it('treat date only string in the timezone specified in the options', function () {
+    assert.equal(formatInTimeZone('2023-04-16', 'GMT', 'MMM dd', { timeZone: 'GMT' }), 'Apr 16')
+  })
+
   describe('shifts the date to the zoned time and formats', function () {
     var date = '1986-04-04T10:32:55.123Z'
     var tests = [