My time is set incorrect...then i try : left click on the clock,adjust date and time...the answer is :

GENERAL (button)

The application KDE control module (kcmshell) crashed and caused the signal 11(SIGSEGV).
An application mostly receives the SIGSEGV signal due to a bug in the applicatoin.The application was asked to save its documents.

and here is the BACKTRACE (button) message/error :

(no debugging symbols found)...(no debugging symbols found)...
(no debugging symbols found)...(no debugging symbols found)...
(no debugging symbols found)...(no debugging symbols found)...
(no debugging symbols found)...(no debugging symbols found)...
(no debugging symbols found)...(no debugging symbols found)...
(no debugging symbols found)...(no debugging symbols found)...[New Thread 16384 (LWP 2419)]

0x40f355c9 in waitpid () from /lib/libpthread.so.0
#0 0x40f355c9 in waitpid () from /lib/libpthread.so.0
#1 0x406219ed in KCrash::defaultCrashHandler(int) ()
from /opt/kde/lib/libkdecore.so.4
#2 0x40f33c45 in __pthread_sighandler () from /lib/libpthread.so.0
#3 <signal handler called>
#4 0x40a7999d in QLineEdit::text() const () from /usr/lib/qt/lib/libqt-mt.so.3
#5 0x4149cf38 in Dtime::set_time() () from /opt/kde/lib/kde3/kcm_clock.so
#6 0x4149a6c3 in Dtime::qt_invoke(int, QUObject*) ()
from /opt/kde/lib/kde3/kcm_clock.so
#7 0x409bbe50 in QObject::activate_signal(QConnectionList*, QUObject*) ()
from /usr/lib/qt/lib/libqt-mt.so.3
#8 0x409bc310 in QObject::activate_signal(int, QString) ()
from /usr/lib/qt/lib/libqt-mt.so.3
#9 0x40ce28c4 in QLineEdit::textChanged(QString const&) ()
from /usr/lib/qt/lib/libqt-mt.so.3
#10 0x40a7fbf3 in QLineEditPrivate::finishChange(int, bool) ()
from /usr/lib/qt/lib/libqt-mt.so.3
#11 0x40a79a6f in QLineEdit::setText(QString const&) ()
from /usr/lib/qt/lib/libqt-mt.so.3
#12 0x40a79bee in QLineEdit::setMaxLength(int) ()
from /usr/lib/qt/lib/libqt-mt.so.3
#13 0x4149c290 in Dtime:time(QWidget*, char const*) ()
from /opt/kde/lib/kde3/kcm_clock.so
#14 0x414a0ff5 in KclockModule::KclockModule(QWidget*, char const*, QStringList const&) () from /opt/kde/lib/kde3/kcm_clock.so
#15 0x414a1a6b in KGenericFactory<KclockModule, QWidget>::createObject(QObject*, char const*, char const*, QStringList const&) ()
from /opt/kde/lib/kde3/kcm_clock.so
#16 0x40637fd1 in KLibFactory::create(QObject*, char const*, char const*, QStringList const&) () from /opt/kde/lib/libkdecore.so.4
#17 0x4002acf8 in ModuleLoader::unloadModule(ModuleInfo const&) ()
from /opt/kde/lib/kcmshell.so
#18 0x4002a46f in KSharedPtr<KService>:perator=(KSharedPtr<KService> const&)
() from /opt/kde/lib/kcmshell.so
#19 0x4002a753 in ModuleLoader::loadModule(ModuleInfo const&, bool) ()
from /opt/kde/lib/kcmshell.so
#20 0x40027926 in main () from /opt/kde/lib/kcmshell.so
#21 0x41083d06 in __libc_start_main () from /lib/libc.so.6

So,how can i adjust date and time to my PC ?

Thank u.

while in KDE,,,,,,,,,,,,,"right click" on the clock, not left.

try timeconfig as root

man date

date -u MMDDhhmm

That's for universal time. You can also use ntpdate or whatever.