_strdate, _wstrdate

项目
06/05/2017

The new home for Visual Studio documentation is Visual Studio 2017 Documentation on docs.microsoft.com.

The latest version of this topic can be found at _strdate, _wstrdate.

Copy current system date to a buffer. More secure versions of these functions are available; see _strdate_s, _wstrdate_s.

Syntax

char *_strdate(  
   char *datestr   
);  
wchar_t *_wstrdate(  
   wchar_t *datestr   
);  
template <size_t size>  
char *_strdate(  
   char (&datestr)[size]  
); // C++ only  
template <size_t size>  
wchar_t *_wstrdate(  
   wchar_t (&datestr)[size]  
); // C++ only

Parameters

datestr
A pointer to a buffer containing the formatted date string.

Return Value

Each of these functions returns a pointer to the resulting character string datestr.

Remarks

More secure versions of these functions are available; see _strdate_s, _wstrdate_s. It is recommended that the more secure functions be used wherever possible.

The _strdate function copies the current system date to the buffer pointed to by datestr, formatted mm/dd/yy, where mm is two digits representing the month, dd is two digits representing the day, and yy is the last two digits of the year. For example, the string 12/05/99 represents December 5, 1999. The buffer must be at least 9 bytes long.

If datestr is a NULL pointer, the invalid parameter handler is invoked, as described in Parameter Validation. If execution is allowed to continue, these functions return -1 and set errno to EINVAL.

_wstrdate is a wide-character version of _strdate; the argument and return value of _wstrdate are wide-character strings. These functions behave identically otherwise.

In C++, these functions have template overloads that invoke the newer, secure counterparts of these functions. For more information, see Secure Template Overloads.

Generic-Text Routine Mappings

TCHAR.H routine	_UNICODE & _MBCS not defined	_MBCS defined	_UNICODE defined
`_tstrdate`	`_strdate`	`_strdate`	`_wstrdate`

Requirements

Routine	Required header
`_strdate`	<time.h>
`_wstrdate`	<time.h> or <wchar.h>

For additional compatibility information, see Compatibility in the Introduction.

Example

// strdate.c  
// compile with: /W3  
#include <time.h>  
#include <stdio.h>  
int main()  
{  
    char tmpbuf[9];  
  
    // Set time zone from TZ environment variable. If TZ is not set,  
    // the operating system is queried to obtain the default value   
    // for the variable.   
    //  
    _tzset();  
  
    printf( "OS date: %s\n", _strdate(tmpbuf) ); // C4996  
    // Note: _strdate is deprecated; consider using _strdate_s instead  
}

OS date: 04/25/03

.NET Framework Equivalent

System::DateTime::Parse

通过