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_get_tzname

Retrieves the character string representation of the time zone name or the daylight standard time zone name (DST).

errno_t _get_tzname(
    size_t* pReturnValue,
    char* timeZoneName,
    size_t sizeInBytes,
    int index    
);

Parameters

  • [out] pReturnValue
    The string length of timeZoneName including a NULL terminator.

  • [out] timeZoneName
    The address of a character string for the representation of the time zone name or the daylight standard time zone name (DST), depending on index.

  • [in] sizeInBytes
    The size of the timeZoneName character string in bytes.

  • [in] index
    The index of one of the two time zone names to retrieve.

Return Value

Zero if successful, otherwise an errno type value.

If either timeZoneName is NULL, or sizeInBytes is zero or less than zero (but not both), an invalid parameter handler is invoked, as described in Parameter Validation. If execution is allowed to continue, this function sets errno to EINVAL and returns EINVAL.

Error Conditions

pReturnValue

timeZoneName

sizeInBytes

index

Return value

Contents of timeZoneName

size of TZ name

NULL

0

0 or 1

0

not modified

size of TZ name

any

> 0

0 or 1

0

TZ name

not modified

NULL

> 0

any

EINVAL

not modified

not modified

any

zero

any

EINVAL

not modified

not modified

any

> 0

> 1

EINVAL

not modified

Remarks

The _get_tzname function retrieves the character string representation of the time zone name or the daylight standard time zone name (DST) into the address of timeZoneName depending on the index value, along with the size of the string in pReturnValue. If timeZoneName is NULL and sizeInBytes is zero, just the size of the string of either time zone in bytes is returned in pReturnValue. The index values must be either 0 for standard time zone or 1 for daylight standard time zone; any other values of index have undetermined results.

Index values

index

Contents of timeZoneName

timeZoneName default value

0

Time zone name

"PST"

1

Daylight standard time zone name

"PDT"

> 1 or < 0

errno set to EINVAL

not modified

Unless the values are explicitly changed during run time, the default values are "PST" and "PDT" respectively. The sizes of these character arrays are governed by TZNAME_MAX value.

Requirements

Routine

Required header

_get_tzname

<time.h>

For more information, see Compatibility.

.NET Framework Equivalent

Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.

See Also

Concepts

Time Management

errno, _doserrno, _sys_errlist, and _sys_nerr

_get_daylight

_get_dstbias

_get_timezone

TZNAME_MAX