1 files changed, 80 insertions, 0 deletions
diff --git a/src/utils/time.cpp b/src/utils/time.cpp
new file mode 100644
index 0000000..bc2c18d
--- /dev/null
+++ b/src/utils/time.cpp
@@ -0,0 +1,80 @@
+#include <utils/time.hpp>
+#include <ctime>
+
+#include <sstream>
+#include <iomanip>
+#include <locale>
+
+#include "biboumi.h"
+
+namespace utils
+{
+std::string to_string(const std::time_t& timestamp)
+{
+  constexpr std::size_t stamp_size = 21;
+  char date_buf[stamp_size];
+  if (std::strftime(date_buf, stamp_size, "%FT%TZ", std::gmtime(&timestamp)) != stamp_size - 1)
+    return "";
+  return {std::begin(date_buf), std::end(date_buf) - 1};
+}
+
+std::time_t parse_datetime(const std::string& stamp)
+{
+  static const char* format = "%Y-%m-%dT%H:%M:%S";
+  std::tm t = {};
+#ifdef HAS_GET_TIME
+  std::istringstream ss(stamp);
+  ss.imbue(std::locale("C"));
+
+  std::string remainings;
+  ss >> std::get_time(&t, format) >> remainings;
+  if (ss.fail())
+    return -1;
+#else
+                                             /* Y   -   m   -   d   T   H   :   M   :   S */
+  constexpr std::size_t stamp_size_without_tz = 4 + 1 + 2 + 1 + 2 + 1 + 2 + 1 + 2 + 1 + 2;
+  if (!strptime(stamp.data(), format, &t)) {
+    return -1;
+  }
+  const std::string remainings(stamp.data() + stamp_size_without_tz);
+#endif
+
+  if (remainings.empty())
+    return -1;
+
+  std::string timezone;
+  // Skip optional fractions of seconds
+  if (remainings[0] == '.')
+    {
+      const auto pos = remainings.find_first_not_of(".0123456789");
+      timezone = remainings.substr(pos);
+    }
+  else
+    timezone = std::move(remainings);
+
+  if (timezone.compare(0, 1, "Z") != 0)
+    {
+      std::stringstream tz_ss;
+      tz_ss << timezone;
+      int multiplier = -1;
+      char prefix;
+      int hours;
+      char sep;
+      int minutes;
+      tz_ss >> prefix >> hours >> sep >> minutes;
+      if (tz_ss.fail())
+        return -1;
+      if (prefix == '-')
+        multiplier = +1;
+      else if (prefix != '+')
+        return -1;
+
+      t.tm_hour += multiplier * hours;
+      t.tm_min += multiplier * minutes;
+    }
+  return ::timegm(&t);
+}
+
+}
+
+