diff --git a/repertory/librepertory/src/providers/s3/s3_provider.cpp b/repertory/librepertory/src/providers/s3/s3_provider.cpp
index 3e796662..18c4b4c8 100644
--- a/repertory/librepertory/src/providers/s3/s3_provider.cpp
+++ b/repertory/librepertory/src/providers/s3/s3_provider.cpp
@@ -73,17 +73,11 @@ auto s3_provider::convert_api_date(std::string_view date) -> std::uint64_t {
   struct tm tm1 {};
 #if defined(_WIN32)
   utils::time::strptime(date_time.c_str(), "%Y-%m-%dT%T", &tm1);
-
-  auto utc_time = _mkgmtime(&tm1);
-  localtime_s(&tm1, &utc_time);
-  return nanos + utils::time::windows_time_t_to_unix_time(mktime(&tm1));
+  return nanos + utils::time::windows_time_t_to_unix_time(_mkgmtime(&tm1));
 #else  // !defined(_WIN32)
   strptime(date_time.c_str(), "%Y-%m-%dT%T", &tm1);
-
-  auto utc_time = timegm(&tm1);
-  return nanos +
-         (static_cast<std::uint64_t>(mktime(localtime_r(&utc_time, &tm1))) *
-          utils::time::NANOS_PER_SECOND);
+  return nanos + (static_cast<std::uint64_t>(timegm(&tm1)) *
+                  utils::time::NANOS_PER_SECOND);
 #endif // defined(_WIN32)
 }