From 4bcf15cb1411ceb2b890bc13eeb371acadcce9ba Mon Sep 17 00:00:00 2001
From: Mate Farkas <f.mate1128@gmail.com>
Date: Wed, 17 Apr 2024 17:06:01 +0200
Subject: [PATCH] Calculate sync dates based on the latest current date in the
 world

---
 Utility/SyncUtility.cs     | 15 ++++++++++++++-
 Utility/TimezoneUtility.cs | 10 ++++++++++
 2 files changed, 24 insertions(+), 1 deletion(-)
 create mode 100644 Utility/TimezoneUtility.cs

diff --git a/Utility/SyncUtility.cs b/Utility/SyncUtility.cs
index c4b2c60..b54b424 100644
--- a/Utility/SyncUtility.cs
+++ b/Utility/SyncUtility.cs
@@ -215,7 +215,20 @@ namespace ConnectionsAPI.Utility
 
             // we iterate on every day between the start date and UTC tomorrow (this should handle +12 timezones as well)
             DateTime syncBeginDate = DateTime.ParseExact(startDate, SHORT_DATE, CultureInfo.InvariantCulture, DateTimeStyles.AssumeUniversal).Date;
-            DateTime syncEndDate = DateTimeOffset.UtcNow.UtcDateTime.Date.AddDays(1);
+            DateTime syncEndDate;
+
+            // try to find the latest date that is currently going on in the world
+            TimeZoneInfo? latestTimezone = TimezoneUtility.GetLatestTimezoneOnSystem();
+            if (latestTimezone != null)
+            {
+                DateTime currentDateInLatestTimezone = TimeZoneInfo.ConvertTimeFromUtc(DateTime.UtcNow, latestTimezone);
+                syncEndDate = new DateTime(currentDateInLatestTimezone.Year, currentDateInLatestTimezone.Month, currentDateInLatestTimezone.Day, 0, 0, 0, DateTimeKind.Utc);
+            }
+            // default to UTC date + 1 day
+            else
+            {
+                syncEndDate = DateTime.UtcNow.Date.AddDays(1);
+            }
 
             foreach (var date in Enumerable.Repeat(0, Convert.ToInt32((syncEndDate - syncBeginDate).TotalDays)).Select((_, idx) => syncBeginDate.AddDays(idx + 1)))
             {
diff --git a/Utility/TimezoneUtility.cs b/Utility/TimezoneUtility.cs
new file mode 100644
index 0000000..62bf9a4
--- /dev/null
+++ b/Utility/TimezoneUtility.cs
@@ -0,0 +1,10 @@
+namespace ConnectionsAPI.Utility
+{
+    public static class TimezoneUtility
+    {
+        public static TimeZoneInfo? GetLatestTimezoneOnSystem() =>
+            TimeZoneInfo.GetSystemTimeZones()
+                .OrderByDescending(x => x.GetUtcOffset(DateTime.UtcNow))
+                .FirstOrDefault();
+    }
+}