From f7e077a7c53fab6b54a4364d47169194b7f13909 Mon Sep 17 00:00:00 2001
From: Tomasz Sowa <t.sowa@ttmath.org>
Date: Tue, 29 Aug 2023 15:02:37 +0200
Subject: [PATCH] add a TimeZone::PrintOffset(...) method

---
 winixd/core/timezone.cpp | 41 +++++++++++++++++++++++++++++++++++++++-
 winixd/core/timezone.h   |  5 +++--
 2 files changed, 43 insertions(+), 3 deletions(-)

diff --git a/winixd/core/timezone.cpp b/winixd/core/timezone.cpp
index 74253aa..73ba18c 100644
--- a/winixd/core/timezone.cpp
+++ b/winixd/core/timezone.cpp
@@ -5,7 +5,7 @@
  */
 
 /* 
- * Copyright (c) 2012-2021, Tomasz Sowa
+ * Copyright (c) 2012-2023, Tomasz Sowa
  * All rights reserved.
  * 
  * Redistribution and use in source and binary forms, with or without
@@ -166,6 +166,45 @@ return local;
 }
 
 
+void TimeZone::PrintOffsetPart(long val, pt::Stream & str)
+{
+	if( val < 10 )
+	{
+		str << '0';
+	}
+
+	str << val;
+}
+
+
+void TimeZone::PrintOffset(time_t offset, pt::Stream & str)
+{
+	bool has_sign = false;
+
+	if( offset < 0 )
+	{
+		has_sign = true;
+		offset = 0 - offset;
+	}
+
+	time_t days = offset / 60 / 60 / 24;
+
+	if( days == 0 )
+	{
+		str << ((has_sign) ? '-' : '+');
+		time_t diff = offset - days * 60 * 60 * 24;
+
+		long hour = int(diff / 60 / 60);
+		long min  = int((diff - hour * 60 * 60) / 60);
+
+		PrintOffsetPart(hour, str);
+		str << ':';
+		PrintOffsetPart(min, str);
+	}
+}
+
+
+
 time_t TimeZone::CalcUTCOffset(const pt::Date & local_date)
 {
 time_t dst_offset = 0;
diff --git a/winixd/core/timezone.h b/winixd/core/timezone.h
index 21a7b29..47c7580 100644
--- a/winixd/core/timezone.h
+++ b/winixd/core/timezone.h
@@ -5,7 +5,7 @@
  */
 
 /* 
- * Copyright (c) 2012-2014, Tomasz Sowa
+ * Copyright (c) 2012-2023, Tomasz Sowa
  * All rights reserved.
  * 
  * Redistribution and use in source and binary forms, with or without
@@ -115,7 +115,7 @@ public:
 	time_t   CalcLocalOffset(const pt::Date & utc_date);
 	time_t   ToLocal(time_t utc_time);
 	pt::Date ToLocal(const pt::Date & utc_date);
-
+	static void PrintOffset(time_t offset, pt::Stream & str); // prints the offset as [+|-]HH:MM:SS e.g.: +02:00:00
 
 	/*
 		 converting from local time to UTC
@@ -157,6 +157,7 @@ private:
 	time_t ParseStrOffset(const wchar_t * str);
 	time_t GetOffset(pt::Space & space);
 	bool   SetTzDst(pt::Space & year);
+	static void PrintOffsetPart(long val, pt::Stream & str);
 
 };