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_strdate_s, _wstrdate_s

Copy the current system date to a buffer. These are versions of _strdate, _wstrdate with security enhancements as described in Security Enhancements in the CRT.

errno_t _strdate_s(
   char *buffer,
   size_t numberOfElements
);
errno_t _wstrdate_s(
   wchar_t *buffer,
   size_t numberOfElements
);
template <size_t size>
errno_t _strdate_s(
   char (&buffer)[size]
); // C++ only
template <size_t size>
errno_t _wstrdate_s(
   wchar_t (&buffer)[size]
); // C++ only

[out] buffer

A pointer to a buffer which will be filled in with the formatted date string.

[in] numberOfElements

Size of the buffer.

Zero if successful. The return value is an error code if there is a failure. Error codes are defined in ERRNO.H; see table below for the exact errors generated by this function. For more information on error codes, see errno.

buffer

numberOfElements

Return

Contents of buffer

NULL

(any)

EINVAL

Not modified

Not NULL (pointing to valid buffer)

0

EINVAL

Not modified

Not NULL (pointing to valid buffer)

0 < numberOfElements < 9

EINVAL

Empty string

Not NULL (pointing to valid buffer)

numberOfElements >= 9

0

Current date formatted as specified in the remarks

Passing in an invalid non NULL value for the buffer will result in an access violation if the numberOfElements parameter is greater than 9.

Passing values for size that is greater than the actual size of the buffer will result in buffer overrun.

These functions provide more secure versions of _strdate and _wstrdate. The _strdate_s function copies the current system date to the buffer pointed to by buffer, 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.

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

If buffer is a NULL pointer, or if numberOfElements is less than 9 characters, 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 if the buffer is NULL or if numberOfElements is less than or equal to 0, or set errno to ERANGE if numberOfElements is less than 9.

In C++, using these functions is simplified by template overloads; the overloads can infer buffer length automatically (eliminating the need to specify a size argument) and they can automatically replace older, non-secure functions with their newer, secure counterparts. For more information, see Secure Template Overloads.

Generic-Text Routine Mapping:

TCHAR.H routine

_UNICODE & _MBCS not defined

_MBCS defined

_UNICODE defined

_tstrdate_s

_strdate_s

_strdate_s

_wstrdate_s

Routine

Required header

_strdate

<time.h>

_wstrdate

<time.h> or <wchar.h>

_strdate_s

<time.h>

See the example for time.

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