// 
// _isindst_nolock from 0x18013c75c to 0x18013ca4e (754 bytes)
// 
// 2 xrefs:
// > _isindst @ 0x18013d327
// > <???> @ 0x180203a28
// 
// This function is hookable on this platform!
// 
// Using BromaIDA 8.0.0 @ https://github.com/Stazzical/BromaIDA
// Using bindings at commit ba9f177b at Thu Jul 16 22:52:06 2026 from https://github.com/geode-sdk/bindings
// 

__int64 __fastcall _isindst_nolock(struct tm *const a1)
{
  unsigned int v2; // edi
  int tm_year; // esi
  int wMilliseconds; // r14d
  int wSecond; // r15d
  int wMinute; // r12d
  int wHour; // r13d
  __int64 wMonth; // rbx
  int v9; // ecx
  int v10; // eax
  __int64 v11; // rdx
  int wDayOfWeek; // ecx
  int wDay; // r8d
  int v14; // eax
  int tm_yday; // eax
  int v17; // ecx
  int v18; // [rsp+98h] [rbp+10h] BYREF

  v2 = 0;
  v18 = 0;
  if ( (unsigned int)sub_18013C6CC(&v18) )
    invoke_watson(nullptr, nullptr, nullptr, 0, 0);
  if ( !v18 )
    return 0;
  tm_year = a1->tm_year;
  if ( tm_year != dword_1801B2140 || tm_year != dword_1801B2150 )
  {
    if ( dword_1801F5660 )
    {
      if ( TimeZoneInformation.DaylightDate.wYear )
      {
        wMilliseconds = TimeZoneInformation.DaylightDate.wMilliseconds;
        wSecond = TimeZoneInformation.DaylightDate.wSecond;
        wMinute = TimeZoneInformation.DaylightDate.wMinute;
        wHour = TimeZoneInformation.DaylightDate.wHour;
        wMonth = TimeZoneInformation.DaylightDate.wMonth;
        if ( unknown_libname_67(tm_year) )
          v9 = dword_18017A634[wMonth];
        else
          v9 = dword_18017A5FC[wMonth];
        dword_1801B2140 = tm_year;
        dword_1801B2144 = v9 + TimeZoneInformation.DaylightDate.wDay;
        dword_1801B2148 = wMilliseconds + 1000 * (wSecond + 60 * (wMinute + 60 * wHour));
      }
      else
      {
        cvtdate(
          0,
          1,
          (unsigned int)tm_year,
          TimeZoneInformation.DaylightDate.wMonth,
          TimeZoneInformation.DaylightDate.wDay,
          TimeZoneInformation.DaylightDate.wDayOfWeek,
          0,
          TimeZoneInformation.DaylightDate.wHour,
          TimeZoneInformation.DaylightDate.wMinute,
          TimeZoneInformation.DaylightDate.wSecond,
          TimeZoneInformation.DaylightDate.wMilliseconds);
      }
      if ( TimeZoneInformation.StandardDate.wYear )
      {
        wDay = TimeZoneInformation.StandardDate.wDay;
        v11 = 0;
        v10 = 0;
        wDayOfWeek = 0;
      }
      else
      {
        v10 = TimeZoneInformation.StandardDate.wDay;
        v11 = 1;
        wDayOfWeek = TimeZoneInformation.StandardDate.wDayOfWeek;
        wDay = 0;
      }
      cvtdate(
        1,
        v11,
        (unsigned int)a1->tm_year,
        TimeZoneInformation.StandardDate.wMonth,
        v10,
        wDayOfWeek,
        wDay,
        TimeZoneInformation.StandardDate.wHour,
        TimeZoneInformation.StandardDate.wMinute,
        TimeZoneInformation.StandardDate.wSecond,
        TimeZoneInformation.StandardDate.wMilliseconds);
    }
    else
    {
      cvtdate(0, 1, (unsigned int)tm_year, (unsigned int)(tm_year < 107) + 3, (tm_year >= 107) + 1, 0, 0, 2, 0, 0, 0);
      v14 = 5;
      if ( tm_year >= 107 )
        v14 = 1;
      cvtdate(1, 1, (unsigned int)a1->tm_year, (unsigned int)(tm_year >= 107) + 10, v14, 0, 0, 2, 0, 0, 0);
    }
  }
  tm_yday = a1->tm_yday;
  if ( dword_1801B2144 >= dword_1801B2154 )
  {
    if ( tm_yday < dword_1801B2154 || tm_yday > dword_1801B2144 )
      return 1;
    if ( tm_yday <= dword_1801B2154 || tm_yday >= dword_1801B2144 )
      goto LABEL_29;
    return 0;
  }
  if ( tm_yday < dword_1801B2144 || tm_yday > dword_1801B2154 )
    return 0;
  if ( tm_yday > dword_1801B2144 && tm_yday < dword_1801B2154 )
    return 1;
LABEL_29:
  v17 = 1000 * (a1->tm_sec + 60 * (a1->tm_min + 60 * a1->tm_hour));
  if ( tm_yday == dword_1801B2144 )
    LOBYTE(v2) = v17 >= dword_1801B2148;
  else
    LOBYTE(v2) = v17 < dword_1801B2158;
  return v2;
}