[Bug 53355] New: Missing functions SystemTimeToTzSpecificLocalTimeEx and TzSpecificLocalTimeToSystemTimeEx

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=53355

Bug ID: 53355
           Summary: Missing functions SystemTimeToTzSpecificLocalTimeEx
                    and TzSpecificLocalTimeToSystemTimeEx
           Product: Wine
           Version: unspecified
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: kernel32
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Created attachment 72743
  --> https://bugs.winehq.org/attachment.cgi?id=72743
tz.exe

Please implement SystemTimeToTzSpecificLocalTimeEx and
TzSpecificLocalTimeToSystemTimeEx. The documentation can be found at
https://docs.microsoft.com/en-us/windows/win32/api/timezoneapi/nf-timezoneapi-systemtimetotzspecificlocaltimeex
and
https://docs.microsoft.com/en-us/windows/win32/api/timezoneapi/nf-timezoneapi-tzspecificlocaltimetosystemtimeex.

Note that because these functions currently outright abort, the work-around I
implemented requires explicitly detecting Wine and not even trying to call
them, which is far from optimal.

Even just implementing stubs that always fail gracefully instead of just
aborting the whole process would be much appreciated.

This came up when improving local timezone handling in OpenMPT. See
https://bugs.openmpt.org/view.php?id=1618 and
https://source.openmpt.org/browse/openmpt?op=comp&compare[]=/trunk/OpenMPT/@17667&compare[]=/trunk/OpenMPT/@17668.

Simple test case (for SystemTimeToTzSpecificLocalTimeEx):

tz.cpp:
```
#include <iostream>
#include <stdexcept>

#include <windows.h>

int main() {
    try {
        SYSTEMTIME sys{};
        GetSystemTime(&sys);
        DYNAMIC_TIME_ZONE_INFORMATION dtzi{};
        if (GetDynamicTimeZoneInformation(&dtzi) == TIME_ZONE_ID_INVALID) {
            throw std::runtime_error("GetDynamicTimeZoneInformation()
failed.");
        }
        SYSTEMTIME sys_local{};
        if (SystemTimeToTzSpecificLocalTimeEx(&dtzi, &sys, &sys_local) ==
FALSE) {
            throw std::runtime_error("SystemTimeToTzSpecificLocalTimeEx()
failed.");
        }
        std::cout << "OK" << std::endl;
        return 0;
    } catch (const std::exception & e) {
        std::cout << std::flush;
        std::cerr << e.what() << std::endl;
        std::cerr << std::flush;
    }
    std::cout << "FAIL" << std::endl;
    return 1;
}
```
built with VS2022 by running `cl /std:c++20 /permissive- /EHsc /O2 /W4 tz.cpp`
results in
```
wine: Call from 0x7bc7c990 to unimplemented function
KERNEL32.dll.SystemTimeToTzSpecificLocalTimeEx, aborting
```
not even reaching the FAIL output. tz.exe attached.