[GitHub] [arrow] palak-9202 commented on a diff in pull request #13428: ARROW-16918: [Gandiva] [C++] Adding UTC-local timezone conversion functions

[GitBox <gi...@apache.org>]

palak-9202 commented on code in PR #13428:
URL: https://github.com/apache/arrow/pull/13428#discussion_r914448375


##########
cpp/src/gandiva/gdv_function_stubs.cc:
##########
@@ -611,6 +611,47 @@ int32_t gdv_fn_cast_intervalyear_utf8_int32(int64_t context_ptr, int64_t holder_
   auto* holder = reinterpret_cast<gandiva::IntervalYearsHolder*>(holder_ptr);
   return (*holder)(context, data, data_len, in1_validity, out_valid);
 }
+
+GANDIVA_EXPORT
+gdv_timestamp to_utc_timezone_timestamp(int64_t context, gdv_timestamp time_miliseconds,
+                                        const char* timezone, gdv_int32 length) {
+  using arrow_vendored::date::time_zone;
+
+  arrow_vendored::date::sys_time <std::chrono::milliseconds> tp
+                                  {std::chrono::milliseconds{time_miliseconds}};
+  try {
+    const time_zone* local_tz = arrow_vendored::date::locate_zone
+                                (std::string(timezone, length));
+    gdv_timestamp offset = local_tz->get_info(tp).offset.count()*1000;
+    return time_miliseconds - static_cast<gdv_timestamp>(offset);
+  } catch(...) {
+      gdv_fn_context_set_error_msg(context, "Invalid time zone");

Review Comment:
   Try:
   for(auto const& z : get_tzdb().zones) {
       cout<<z.name()<<'\n';
     }



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