1 files changed, 52 insertions, 0 deletions
diff --git a/src/utils/calendar.cpp b/src/utils/calendar.cpp
new file mode 100644
index 000000000..14f0113f2
--- /dev/null
+++ b/src/utils/calendar.cpp
@@ -0,0 +1,52 @@
+/*
+* Calendar Functions
+* (C) 1999-2010 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#include <botan/calendar.h>
+#include <botan/exceptn.h>
+#include <ctime>
+
+namespace Botan {
+
+namespace {
+
+std::tm do_gmtime(std::time_t time_val)
+   {
+   std::tm tm;
+
+#if defined(BOTAN_TARGET_OS_HAS_GMTIME_S)
+   gmtime_s(&tm, &time_val); // Windows
+#elif defined(BOTAN_TARGET_OS_HAS_GMTIME_R)
+   gmtime_r(&time_val, &tm); // Unix/SUSv2
+#else
+   std::tm* tm_p = std::gmtime(&time_val);
+   if (tm_p == 0)
+      throw Encoding_Error("time_t_to_tm could not convert");
+   tm = *tm_p;
+#endif
+
+   return tm;
+   }
+
+}
+
+/*
+* Convert a time_point to a calendar_point
+*/
+calendar_point calendar_value(
+   const std::chrono::system_clock::time_point& time_point)
+   {
+   std::tm tm = do_gmtime(std::chrono::system_clock::to_time_t(time_point));
+
+   return calendar_point(tm.tm_year + 1900,
+                         tm.tm_mon + 1,
+                         tm.tm_mday,
+                         tm.tm_hour,
+                         tm.tm_min,
+                         tm.tm_sec);
+   }
+
+}