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c++datetime-t

Set string as current date

I need to write files with the current date included in the name. Currently this is what I have tried:

    time_t t = time(0);
    struct tm * now = localtime(&t);
    string date=now->tm_mday+'/'+(now->tm_mon+1)+'/'+(now->tm_year+1900);

Preferably I'd like to keep this method of getting the date as I have used it earlier on in my program.

Solution

  • I would use std::put_time, something like this: 

    time_t t = time(0);
struct tm * now = localtime(&t);

your_file << std::put_time(now, "%d/%m/%Y");

    If you mean that you need to include the date in the name of a new file, then write to a stringstream, and use your_stream.str() to get a string containing the value.

    If (though it strikes me as unlikely) you find that imposes excessive overhead, you could use strftime instead. It writes a date/time directly to a C-style string:

    char buffer[64];

strftime(buffer, sizeof(buffer), "%d/%m/%Y", now);