strftime issue with different formats

Asked Jan 13 '18 at 15:17

Active Jan 13 '18 at 15:33

Viewed 135 times

string Account::dateCreated(){
    time_t rawtime;
    struct tm * timeinfo;
    char buffer [80];

    time (&rawtime);
    timeinfo = localtime (&rawtime);

        strftime (buffer,80,"%a %b %d %T %Z %Y",timeinfo);
        return buffer;
}

For some reason this does not return anything but when I change this slightly it works:

string Account::dateCreated(){
    time_t rawtime;
    struct tm * timeinfo;
    char buffer [80];

    time (&rawtime);
    timeinfo = localtime (&rawtime);

    strftime (buffer,80,"%A %d/%m/%Y",timeinfo);
    return buffer;
}

The output before was: nothing

The output now is: Saturday 13/01/2018

edited Jan 13 '18 at 15:33

Jonathan Mee

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asked Jan 13 '18 at 15:17

Neil Shah

[How to return local array in C++?](//stackoverflow.com/q/7769998) – 001 Jan 13 '18 at 15:23
What compiler are you working with? – Jonathan Mee Jan 13 '18 at 15:24
MinGW compiler and eclipse ide – Neil Shah Jan 13 '18 at 15:29
@JohnnyMopp I thought that at first too, but it looks like its being converted to a string. – Jonathan Mee Jan 13 '18 at 15:30
@JonathanMee Yes, it's unclear as OP has `string` and `String` return types. – 001 Jan 13 '18 at 15:31
it is a string. – Neil Shah Jan 13 '18 at 15:32
here is my reference: http://www.cplusplus.com/reference/ctime/strftime/ – Neil Shah Jan 13 '18 at 15:32
@NeilShah So this is working for me on gcc6.3 Can you ell me what version of gcc you're using? – Jonathan Mee Jan 13 '18 at 15:35
Seems to work ok (with std::string) on ideone: https://ideone.com/3UkJZc – 001 Jan 13 '18 at 15:35
how do I figure that out – Neil Shah Jan 13 '18 at 15:39
https://stackoverflow.com/a/18296299/2642059 – Jonathan Mee Jan 13 '18 at 15:41
I have no idea but I got MinGW in December 2017 – Neil Shah Jan 13 '18 at 15:47
Find your gcc executable and run: gcc --version – Jonathan Mee Jan 13 '18 at 15:48
I have gcc 6.3.0 – Neil Shah Jan 13 '18 at 16:47
If `localtime` is being called by more than one thread in your program, the value of `*timeinfo` can be compromised between the call to `localtime` and the call to `strftime`. – Howard Hinnant Jan 13 '18 at 17:24
then what should I do – Neil Shah Jan 14 '18 at 14:41
It depends on your needs. Personally I decided to never use the C API again, [write my own API](https://github.com/HowardHinnant/date), and then [try to get it standardized](https://wg21.link/p0355). – Howard Hinnant Jan 14 '18 at 15:02
1

I figured it out. for some reason "%T" is not working on my computer. – Neil Shah Jan 14 '18 at 16:29
@NeilShah Good research sir. It would probably be helpful to answer your own question here and accept it in case anyone else working with MGWin stumbles into the same issue. – Jonathan Mee Jan 15 '18 at 01:41

strftime issue with different formats

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