time_t to displayable format?

time_t to displayable format?

• karande23

  Once you are using MFC, you can avoid all that rope dancing by searching for time_t_to_human_radable_string_CRTs or cool_STL_stuff_that_can_do_everything.
  
  Well, let's say we have a time_t value.
  

  • Both MFC classes CTime and COleDateTime have a constructor taking a time_t parameter.
    
  • Both MFC classes CTime and COleDateTime have a member function Format

  Then you can do something like in the following two examples

  // returns date in "dd.mm.yyyy" format
  CString time_t_ToString(time_t tt)
  {
    CTime tim = tt;
    return tim.Format(_T("%d.%m.%Y"));
  }
  
  // returns date/time formatted according to user locale settings
  CString time_t_ToString2(time_t tt)
  {
    COleDateTime tim = tt;
    return tim.Format();
  }

  
  
  

• Timmy0614

  Well I don't know what all this MFC stuff is about, but then I come from a C background. There is a whole family of functions for use with time_t values. You use ctime() for simple formatting. Or, for more control, use gmtime() or localtime() to split the time_t into fields inside a struct tm. Then you can use strftime() to format the time exactly how you like; you provide a format specification much like you do for printf().

  Why store the time_t as a REG_SZ inside the registry Easier just to store it as a REG_BINARY value. I would have said store it as a REG_DWORD, but now time_t tends to be 64 bits rather than 32.

  
  

• Andrew Buyan

  See http://msdn2.microsoft.com/en-us/library/w4ddyt9h.aspx, especially the section marked "Convert time from type time_t, __time32_t or __time64_t to character string. [...]"

  You cannot simply cast numbers to strings. To convert them, you will have to either use one of the functions of the atoi-family (http://msdn.microsoft.com/library/default.asp url=/library/en-us/vclib/html/_crt_atof.2c_.atoi.2c_._atoi64.2c_.atol.asp), or by piping them through STL streams. The latter can be simplified through a helper function such as

  template<class T> string tostring(const T& source)
  {
      ostringstream oss;
      oss << source;
      return oss.str();
  };

  Which can be used in a fashion such as

  MessageBox(0, tostring(42).c_str(), 0, 0);

  
  
  

• helsingfors

  Thanks guys... appreciate it. I started programming using java, so i'm not used to casting with c++.
  
  
  

• medel

  Ovidiu Cucu wrote:

  Once you are using MFC, you can avoid all that rope dancing by searching for time_t_to_human_radable_string_CRTs or cool_STL_stuff_that_can_do_everything.

  Well that's somewhat harsh :)

  The STL part addressed his second question, regarding lexical casts of numbers. For the sake of being portable, and not locked to MFC for even the most trivial of tasks, I suggested the stringstream approach.

  
  
  
• time_t to displayable format?