C / C++ / MFC

Quote:

the filetime stored on the disk is also UTC

CTime time2(status.m_mtime);
time_t tt = time2.GetTime();
struct tm* timeinfo;
timeinfo = localtime(&tt);
time_t tt2 = mktime(timeinfo);
CTime time3(tt2);
SYSTEMTIME stUTC, stLocal;
time3.GetAsSystemTime(stUTC);
TIME_ZONE_INFORMATION tzi;
GetTimeZoneInformation(&tzi);
SystemTimeToTzSpecificLocalTime(&tzi, &stUTC, &stLocal);
CTime time4(stLocal);
TRACE("%d:%d\n", time4.GetHour(), time4.GetMinute());

Flaviu2 wrote:

dates less than october 2013 is incremented by 3 hours, and date greater than october 2013 is incremented by 2

2013-09-19 16:02 EEST
2013-09-20 10:57 EEST
2013-11-21 12:39 EET

2013-09-19 13:02 Z
2013-09-20 07:57 Z
2013-11-21 10:39 Z

file1.bmp ------- 9/19/2013 01:02 PM
file2.bmp ------- 9/20/2013 07:57 PM
file3.bmp ------- 11/21/2013 10:39 AM

file1.bmp ------- 9/19/2013 02:02 PM (+1 hour)
file2.bmp ------- 9/20/2013 08:57 PM (+1 hour)
file3.bmp ------- 11/21/2013 10:39 AM

file1.bmp ------- 9/19/2013 02:02 PM (+1 hour)
file2.bmp ------- 9/20/2013 08:57 PM (+1 hour)
file3.bmp ------- 11/21/2013 10:39 AM

file1.bmp ------- 9/19/2013 01:02 PM
file2.bmp ------- 9/20/2013 07:57 PM
file3.bmp ------- 11/21/2013 10:39 AM

(UTC + 2) Athens, Bucharest, Istanbul
Automatically adjust clock for Daylight Saving Time checked

(GMT + 2) Bucharest
Automatically adjust clock for daylight saving clock checked

Quote:

For example, Windows Explorer applies the time zone and the DST setting to the UTC timestamp before it displays dates and times for files in a Windows NT File System (NTFS) directory.

CFileStatus status;
CFile::GetStatus(sPath, status);

SYSTEMTIME systimeFile;
status.m_mtime.GetAsSystemTime(systimeFile);
COleDateTime dt(systimeFile);

if(m_bGreaterThanXP)
{
    TIME_ZONE_INFORMATION tzi;
    DWORD dwTZI = GetTimeZoneInformation(&tzi);
    if(dwTZI == TIME_ZONE_ID_STANDARD || dwTZI == TIME_ZONE_ID_DAYLIGHT)
    {
        SYSTEMTIME stLocal;
        SystemTimeToTzSpecificLocalTime(&tzi, &systimeFile, &stLocal);
        COleDateTime dtLocal(stLocal);
        COleDateTimeSpan span(0, 0, (int)tzi.Bias, 0);
        dt = dtLocal + span;
    }
}

CString sTime = dt.Format(VAR_TIMEVALUEONLY);

m_bGreaterThanXP = FALSE;

OSVERSIONINFO osvi;
ZeroMemory(&osvi, sizeof(OSVERSIONINFO));
osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
GetVersionEx(&osvi);
 if(osvi.dwMajorVersion > 5)
     m_bGreaterThanXP = TRUE;

int i = 10;
int result;
result = i++;  // result equals 10, i equals 11
result = ++i;  // result equals 12, i equals 12
result = i--;  // result equals 12, i equals 11
result = --i;  // result equals 10, i equals 10

// note do not use expressions such as
result = ++i + i++; // results undefined

int i = 10;
int result;
result = i++;  // result equals 10, i equals 11
result = ++i;  // result equals 12, i equals 12
result = i--;  // result equals 12, i equals 11
result = --i;  // result equals 10, i equals 10

// note do not use expressions such as
result = ++i + i++; // results undefined

Richard MacCutchan wrote:

but it is still worth avoiding expressions of that sort.

Marco Bertschi wrote:

my comment was intended to be an addition to yours.

sukanta kumar mangal wrote:

As written the last line gives output undefine i think its wrong .it will give correct output as 23.
If u had checked then u already got the result.
here i will explan u how it's work..

i = 10;
i = i + 1; // pre-increment of the first argument
first_arg = i;
second_arg = i;
i = i + 1; // post-increment of the second argument
result = first_arg + second_arg; // 11 + 11

i = 10;
second_arg = i;
i = i + 1; // post-increment of second argument
i = i + 1; // pre-increment of first argument
first_arg = 1;
result = first_arg + second_arg; // 12 + 10