message: use datatime conversion provided by Azure::Core
diff: #include "azure/storage/common/storage_per_retry_policy.hpp"
  -#include <ctime>
  -
  +#include <azure/core/datetime.hpp>
  #include <azure/core/platform.hpp>
  namespace Azure { namespace Storage { namespace Details {
  @@ -21,24 +20,9 @@ namespace Azure { namespace Storage { namespace Details {
  if (headers.find(HttpHeaderDate) == headers.end())
  {
  // add x-ms-date header in RFC1123 format
  - // TODO: call helper function provided by Azure Core when they provide one.
  - time_t t = std::time(nullptr);
  - struct tm ct;
  -#if defined(AZ_PLATFORM_WINDOWS)
  - gmtime_s(&ct, &t);
  -#elif defined(AZ_PLATFORM_POSIX)
  - gmtime_r(&t, &ct);
  -#endif
  - static const char* weekdays[] = {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
  - static const char* months[]
  - = {"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
  - std::string rfc1123Format = "%a, %d %b %Y %H:%M:%S GMT";
  - rfc1123Format.replace(rfc1123Format.find("%a"), 2, weekdays[ct.tm_wday]);
  - rfc1123Format.replace(rfc1123Format.find("%b"), 2, months[ct.tm_mon]);
  - char datetimeStr[32];
  - std::strftime(datetimeStr, sizeof(datetimeStr), rfc1123Format.data(), &ct);
  -
  - request.AddHeader(HttpHeaderXMsDate, datetimeStr);
  + request.AddHeader(
  + HttpHeaderXMsDate,
  + Core::DateTime::Now().GetString(Azure::Core::DateTime::DateFormat::Rfc1123));
  }
  return nextHttpPolicy.Send(ctx, request);
  