How to add time stamp a text file?

I am trying add time stamp to a text file to prevent it over written.


The example below allow user to save to a same file called group.txt.  but if 2 or more
user run the program the file group.txt will be over written.  Is it a way to save
the group.txt more than one version using time stamp?

Here is the example:

FILE *myfile;

myfile = fopen("/home2/user/tmp/group.txt", "w");
        fprintf (myfile, "%s\n", "Testing..testing..testing");
        fclose (myfile);
       
Thanks.
malaouAsked:
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twalgraveCommented:
you will have to rename the file using the timestamp information so group.txt becomes group_2003_02_24_1015.txt.

Alternatively, you can write each person's file in a different location

Still yet, you can append to the file instead of overwriting and put in the the userID upon each write and search it by userid.
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malaouAuthor Commented:
Hi twalgrave,

How to rename the file using the timestamp information so group.txt becomes group_2003_02_24_1015.txt??

Please provide some example.

Thanks.
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vpomonaCommented:
char buffer[10];
GetSystemTime(&LocalSystemTime);
CString     FileName= _itoa(LocalSystemTime.wDay,buffer,10);
     FileName += _itoa(LocalSystemTime.wMonth,buffer,10);
     FileName += _itoa(LocalSystemTime.wYear,buffer,10);
     FileName += _itoa(LocalSystemTime.wHour,buffer,10);
     FileName += _itoa(LocalSystemTime.wMinute,buffer,10);
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vpomonaCommented:
char buffer[10];
GetSystemTime(&LocalSystemTime);
CString     FileName= _itoa(LocalSystemTime.wDay,buffer,10);
     FileName += _itoa(LocalSystemTime.wMonth,buffer,10);
     FileName += _itoa(LocalSystemTime.wYear,buffer,10);
     FileName += _itoa(LocalSystemTime.wHour,buffer,10);
     FileName += _itoa(LocalSystemTime.wMinute,buffer,10);
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CleanupPingCommented:
malaou:
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