//
// enumerate all time zones till find a match and with valid key name
//
internal static unsafe bool FindMatchToCurrentTimeZone(TimeZoneInformation timeZoneInformation)
{
uint index = 0;
uint result = 0; // ERROR_SUCCESS
bool notSupportedDaylightSaving = CheckDaylightSavingTimeNotSupported(timeZoneInformation);
TIME_DYNAMIC_ZONE_INFORMATION tdzi = new TIME_DYNAMIC_ZONE_INFORMATION();
while (result == 0)
{
result = Interop.mincore.EnumDynamicTimeZoneInformation(index, out tdzi);
if (result == 0)
{
string s = new String(tdzi.StandardName);
if (!String.IsNullOrEmpty(s) &&
EqualStandardDates(timeZoneInformation, ref tdzi) &&
(notSupportedDaylightSaving || EqualDaylightDates(timeZoneInformation, ref tdzi)) &&
String.Compare(s, timeZoneInformation.StandardName, StringComparison.Ordinal) == 0)
{
// found a match
timeZoneInformation.TimeZoneKeyName = s;
return(true);
}
}
index++;
}
return(false);
}
public unsafe TimeZoneInformation(TIME_DYNAMIC_ZONE_INFORMATION dtzi)
{
StandardName = new string(dtzi.StandardName);
DaylightName = new string(dtzi.DaylightName);
TimeZoneKeyName = new string(dtzi.TimeZoneKeyName);
Dtzi = dtzi;
}
private static bool EqualDaylightDates(TimeZoneInformation timeZone, ref TIME_DYNAMIC_ZONE_INFORMATION tdzi)
{
return(timeZone.Dtzi.DaylightBias == tdzi.DaylightBias &&
timeZone.Dtzi.DaylightDate.wYear == tdzi.DaylightDate.wYear &&
timeZone.Dtzi.DaylightDate.wMonth == tdzi.DaylightDate.wMonth &&
timeZone.Dtzi.DaylightDate.wDayOfWeek == tdzi.DaylightDate.wDayOfWeek &&
timeZone.Dtzi.DaylightDate.wDay == tdzi.DaylightDate.wDay &&
timeZone.Dtzi.DaylightDate.wHour == tdzi.DaylightDate.wHour &&
timeZone.Dtzi.DaylightDate.wMinute == tdzi.DaylightDate.wMinute &&
timeZone.Dtzi.DaylightDate.wSecond == tdzi.DaylightDate.wSecond &&
timeZone.Dtzi.DaylightDate.wMilliseconds == tdzi.DaylightDate.wMilliseconds);
}
private static bool EqualStandardDates(TimeZoneInformation timeZone, ref TIME_DYNAMIC_ZONE_INFORMATION tdzi)
{
return timeZone.Dtzi.Bias == tdzi.Bias
&& timeZone.Dtzi.StandardBias == tdzi.StandardBias
&& timeZone.Dtzi.StandardDate.wYear == tdzi.StandardDate.wYear
&& timeZone.Dtzi.StandardDate.wMonth == tdzi.StandardDate.wMonth
&& timeZone.Dtzi.StandardDate.wDayOfWeek == tdzi.StandardDate.wDayOfWeek
&& timeZone.Dtzi.StandardDate.wDay == tdzi.StandardDate.wDay
&& timeZone.Dtzi.StandardDate.wHour == tdzi.StandardDate.wHour
&& timeZone.Dtzi.StandardDate.wMinute == tdzi.StandardDate.wMinute
&& timeZone.Dtzi.StandardDate.wSecond == tdzi.StandardDate.wSecond
&& timeZone.Dtzi.StandardDate.wMilliseconds == tdzi.StandardDate.wMilliseconds;
}
//
// enumerate all time zones till find a match and with valid key name
//
internal static unsafe bool FindMatchToCurrentTimeZone(TimeZoneInformation timeZoneInformation)
{
uint index = 0;
uint result = 0; // ERROR_SUCCESS
bool notSupportedDaylightSaving = CheckDaylightSavingTimeNotSupported(timeZoneInformation);
TIME_DYNAMIC_ZONE_INFORMATION tdzi = new TIME_DYNAMIC_ZONE_INFORMATION();
while (result == 0)
{
result = Interop.mincore.EnumDynamicTimeZoneInformation(index, out tdzi);
if (result == 0)
{
string s = new String(tdzi.StandardName);
if (!String.IsNullOrEmpty(s) &&
EqualStandardDates(timeZoneInformation, ref tdzi) &&
(notSupportedDaylightSaving || EqualDaylightDates(timeZoneInformation, ref tdzi)) &&
String.Compare(s, timeZoneInformation.StandardName, StringComparison.Ordinal) == 0)
{
// found a match
timeZoneInformation.TimeZoneKeyName = s;
return true;
}
}
index++;
}
return false;
}
