From 049bb5bd9c81e4b13a5804515daf19fa788fbeda Mon Sep 17 00:00:00 2001
From: mike12345567 <me@michaeldrury.co.uk>
Date: Fri, 13 May 2022 23:44:56 +1200
Subject: [PATCH] Addresses #5731 - offset the UTC offset in ISO strings to
 allow date only columns in external DBs to save the correct date when in a
 timezone differing from UTC.

---
 packages/bbui/src/Form/Core/DatePicker.svelte | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/packages/bbui/src/Form/Core/DatePicker.svelte b/packages/bbui/src/Form/Core/DatePicker.svelte
index fd67fa41bb..04e54d9a16 100644
--- a/packages/bbui/src/Form/Core/DatePicker.svelte
+++ b/packages/bbui/src/Form/Core/DatePicker.svelte
@@ -58,6 +58,11 @@
     if (timeOnly) {
       newValue = `2000-01-01T${newValue.split("T")[1]}`
     }
+    // date only, offset for timezone so always right date
+    else if (!enableTime) {
+      const offset = dates[0].getTimezoneOffset() * 60000
+      newValue = new Date(dates[0].getTime() - offset).toISOString()
+    }
     dispatch("change", newValue)
   }