From acbae572d32b80fd90c9a3465cc88fd72a51f36a Mon Sep 17 00:00:00 2001
From: bunnei <bunneidev@gmail.com>
Date: Wed, 19 Aug 2020 18:27:31 -0400
Subject: [PATCH] Revert "common/time_zone: Simplify GetOsTimeZoneOffset()"

---
 src/common/time_zone.cpp | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/src/common/time_zone.cpp b/src/common/time_zone.cpp
index 7aa1b59ea..ce239eb63 100644
--- a/src/common/time_zone.cpp
+++ b/src/common/time_zone.cpp
@@ -3,9 +3,8 @@
 // Refer to the license.txt file included.
 
 #include <chrono>
-#include <ctime>
-
-#include <fmt/chrono.h>
+#include <iomanip>
+#include <sstream>
 
 #include "common/logging/log.h"
 #include "common/time_zone.h"
@@ -17,8 +16,13 @@ std::string GetDefaultTimeZone() {
 }
 
 static std::string GetOsTimeZoneOffset() {
-    // Get the current timezone offset, e.g. "-400", as a string
-    return fmt::format("%z", fmt::localtime(std::time(nullptr)));
+    const std::time_t t{std::time(nullptr)};
+    const std::tm tm{*std::localtime(&t)};
+
+    std::stringstream ss;
+    ss << std::put_time(&tm, "%z"); // Get the current timezone offset, e.g. "-400", as a string
+
+    return ss.str();
 }
 
 static int ConvertOsTimeZoneOffsetToInt(const std::string& timezone) {