guiyanakuang commented on pull request #967:
URL: https://github.com/apache/orc/pull/967#issuecomment-985389979
@wgtmac , Unfortunately I think this is a new issue.
```c++
int main(int,char* argv[]){
struct tm timeStruct;
std::string name = "0001-01-01 00:00:00.000";
char *left=strptime(name.c_str(), "%Y-%m-%d %H:%M:%S", &timeStruct);
time_t _time = timegm(&timeStruct);
char *tail;
double d = strtod(left, &tail);
long na;
if (tail != left) {
na = static_cast<long>(d * 1000000000.0);
} else {
na = 0;
}
std::cout << _time << " " << na << std::endl;
}
```
On my mac machine the output is "-1 0"
Using the online C++ runtime environment claimed on Linux, the output is
"-62135596800 0"
Time format strings that appear to be older than 1970 get -1 on the mac.
> https://github.com/apache/orc/blob/main/c%2B%2B/test/TestWriter.cc#L621
> https://github.com/apache/orc/blob/main/c%2B%2B/test/TestWriter.cc#L741
It looks like the first test verifies that we can write time as a negative
number.
The second one holds our custom time zone. So I think this is a new issue.
Of course I verified the `converted_by_cpp.orc` uploaded by the user in
ORC-1055, and it is clear that it is not converted on the mac, so there should
be another issue that is not yet clear
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