From e7c25b2194406ba8dc05f2ada5f8293aca547f3c Mon Sep 17 00:00:00 2001
From: Andrew Kingston <andrew@kingston.dev>
Date: Sat, 13 Aug 2022 16:25:01 +0100
Subject: [PATCH] Fix flatpickr offsetting date by one hour on initial
 selection of time-only fields

---
 packages/bbui/src/Form/Core/DatePicker.svelte | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/packages/bbui/src/Form/Core/DatePicker.svelte b/packages/bbui/src/Form/Core/DatePicker.svelte
index 39a7d9d626..c3eee7505f 100644
--- a/packages/bbui/src/Form/Core/DatePicker.svelte
+++ b/packages/bbui/src/Form/Core/DatePicker.svelte
@@ -59,6 +59,13 @@
 
     // If time only set date component to 2000-01-01
     if (timeOnly) {
+      // Classic flackpickr causing issues.
+      // When selecting a time first the first time for a "time only" field,
+      // the time is always offset by 1 hour for some reason (regardless of time
+      // zone) so we need to correct it.
+      if (!value && newValue) {
+        newValue = new Date(dates[0].getTime() + 60 * 60 * 1000).toISOString()
+      }
       newValue = `2000-01-01T${newValue.split("T")[1]}`
     }