Getting the date and write a file with it in it.

Hello Ya'll, I've been having a bit of trouble trying to get the system's date. And then saving a file with the date in it. For example today is 31-10-06. It would be cool if I could save the file as CKVproject311006.htm (or CKVproject31102006.htm). So that everyday I make a new file it will save it towards the date.

Thanks for reading and I hope someone can help me =)

I think you need to include the Windows.h header for this (assuming you're using Windows...)

Code:

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SYSTEMTIME s;       
GetSystemTime(&s);

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then you could do something along the lines of

Code:

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char* fname;
sprintf(fname, "CKVproject%d%d%d.htm", s.wDay, s.wMonth, s.wYear);

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I believe that should do what you want...not sure if the syntax is precise though.

Quote:

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Code:

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sprintf(fname, "CKVproject%d%d%d.htm", s.wDay, s.wMonth, s.wYear);

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better use format "%02d%02d%04d"

> char* fname;
> sprintf(fname, "CKVproject%d%d%d.htm", s.wDay, s.wMonth, s.wYear);
You also need to make sure the thing you're trying to print into is actually pointing to allocated space.

what about the portable time.h library? in that is a function that does this kind of stuff, strftime() i believe. hang on i go get the prototype.

Code:

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size_t strftime(char *s, size_t maxsize, const char *format, const struct tm *timeptr);

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i know that is the C version, but i don't know the C++ equivilant. i just realised you would have to know the format codes as well.

%d == day of the month, 01-31
%m == month of the year, 01-12
%y == year without century, 00-99
NB: they are case sensative. any unknown characters are put straight into the string as is.
also NB: use localtime(time(NULL)) to get the "struct tm *timeptr"

hope that helped ;)

Sorry to say guys, but these codes don't work >.<

It will simply exit without an error when I want to write a file...

have you checked that the file name created is actually what you planned to build? before trying to open the file with such a name?
have you tried to create the file with such name from the command prompt?

Of course posting "it doesn't work" without posting any code at all REALLY helps us to figure out what problem you're facing :rolleyes:

But we can just answer:
"I compiled it and it worked!"
also without posting any code. Easy, hah?