Current date and time as string

Question

I wrote a function to get a current date and time in format  DD-MM-YYYY HH MM SS  It works but let s say  its pretty ugly  How can I do exactly the same thing but simpler   string currentDateToString         time t now   time 0       tm  ltm   localtime  amp now        string dateString       tmp           tmp   numToString ltm- gt tm mday       if  tmp length      1          tmp insert 0   0        dateString    tmp      dateString     -       tmp   numToString 1   ltm- gt tm mon       if  tmp length      1          tmp insert 0   0        dateString    tmp      dateString     -       tmp   numToString 1900   ltm- gt tm year       dateString    tmp      dateString             tmp   numToString ltm- gt tm hour       if  tmp length      1          tmp insert 0   0        dateString    tmp      dateString             tmp   numToString 1   ltm- gt tm min       if  tmp length      1          tmp insert 0   0        dateString    tmp      dateString             tmp   numToString 1   ltm- gt tm sec       if  tmp length      1          tmp insert 0   0        dateString    tmp       return dateString

User · Answer

you can use asctime    function of time h to get a string simply       time t  tm  time NULL     struct tm   curtime   localtime    amp  tm    cout lt  lt  The current date time is   lt  lt asctime curtime     Sample output   The current date time is Fri Oct 16 13 37 30 2015

User · Answer

include  lt chrono gt   include  lt iostream gt   int main         std  time t ct   std  time 0       char  cc   ctime  amp ct        std  cout  lt  lt  cc  lt  lt  std  endl      return 0

User · Answer

I wanted to use the C  11 answer  but I could not because GCC 4 9 does not support std  put time   std  put time implementation status in GCC   I ended up using some C  11 to slightly improve the non-C  11 answer   For those that can t use GCC 5  but would still like some C  11 in their date time format    std  array lt char  64 gt  buffer   buffer fill 0    time t rawtime   time  amp rawtime    const auto timeinfo   localtime  amp rawtime    strftime buffer data    sizeof buffer     d- m- Y  H- M- S   timeinfo    std  string timeStr buffer data

User · Answer

Using C   in MS Visual Studio 2015  14   I use    include  lt chrono gt   string NowToString       chrono  system clock  time point p   chrono  system clock  now      time t t   chrono  system clock  to time t p     char str 26     ctime s str  sizeof str   amp t     return str

User · Answer

Since C  11 you could use std  put time from iomanip header    include  lt iostream gt   include  lt iomanip gt   include  lt ctime gt   int main         auto t   std  time nullptr       auto tm    std  localtime  amp t       std  cout  lt  lt  std  put time  amp tm    d- m- Y  H- M- S    lt  lt  std  endl      std  put time is a stream manipulator  therefore it could be used together with std  ostringstream in order to convert the date to a string    include  lt iostream gt   include  lt iomanip gt   include  lt ctime gt   include  lt sstream gt   int main         auto t   std  time nullptr       auto tm    std  localtime  amp t        std  ostringstream oss      oss  lt  lt  std  put time  amp tm    d- m- Y  H- M- S        auto str   oss str         std  cout  lt  lt  str  lt  lt  std  endl

User · Answer

Non C  11 solution  With the  lt ctime gt  header  you could use strftime  Make sure your buffer is large enough  you wouldn t want to overrun it and wreak havoc later    include  lt iostream gt   include  lt ctime gt   int main        time t rawtime    struct tm   timeinfo    char buffer 80      time   amp rawtime     timeinfo   localtime  amp rawtime      strftime buffer sizeof buffer    d- m- Y  H  M  S  timeinfo     std  string str buffer      std  cout  lt  lt  str     return 0

[c++] Current date and time as string

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