How to format the date and time which was declared by CTime using CString?

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C++

I have to log the system time to my app log file but I am not able to format it and I dont know the proper format specifier for CTime datatype. I just used "%c" format specifier it gives some junk as result.

CString str;

m_testTime = CTime::GetCurrentTime();

str.Format(_T("%c"),m_testTime);   // not working fine
LOG(LOG_DEBUG, _T("\nSystem time :") + str);

m_nRunNumber = 10;                      //Below part working fine
str.Format(_T("%d"), mvData.m_nRunNumber);
LOG(LOG_DEBUG, _T("\nRun number: ") + str);

Pls help with this

[edit]Code block added - OriginalGriff[/edit]