GetDurationFormat function (winnls.h)

Formats a duration of time as a time string for a locale specified by identifier.

Note  For interoperability reasons, the application should prefer the GetDurationFormatEx function to GetDurationFormat because Microsoft is migrating toward the use of locale names instead of locale identifiers for new locales. Any application that runs only on Windows Vista and later should use GetDurationFormatEx.


int GetDurationFormat(
  [in]            LCID             Locale,
  [in]            DWORD            dwFlags,
  [in, optional]  const SYSTEMTIME *lpDuration,
  [in]            ULONGLONG        ullDuration,
  [in, optional]  LPCWSTR          lpFormat,
  [out, optional] LPWSTR           lpDurationStr,
  [in]            int              cchDuration


[in] Locale

Locale identifier that specifies the locale for which this function formats the duration. You can use the MAKELCID macro to create a locale identifier or use one of the following predefined values.

Windows Vista and later: The following custom locale identifiers are also supported.

[in] dwFlags

Flags specifying function options. If lpFormat is not set to NULL, this parameter must be set to 0. If lpFormat is set to NULL, your application can specify LOCALE_NOUSEROVERRIDE to format the string using the system default duration format for the specified locale.

Caution  Use of LOCALE_NOUSEROVERRIDE is strongly discouraged as it disables user preferences.

[in, optional] lpDuration

Pointer to a SYSTEMTIME structure that contains the time duration information to format. If this pointer is NULL, the function ignores this parameter and uses ullDuration.

[in] ullDuration

64-bit unsigned integer that represents the number of 100-nanosecond intervals in the duration. If both lpDuration and ullDuration are present, lpDuration takes precedence. If lpDuration is set to NULL and ullDuration is set to 0, the duration is zero.

[in, optional] lpFormat

Pointer to the format string. For details, see the lpFormat parameter of GetDurationFormatEx.

[out, optional] lpDurationStr

Pointer to the buffer in which the function retrieves the duration string.

Alternatively, this parameter can contain NULL if cchDuration is set to 0. In this case, the function returns the required size for the duration string buffer.

[in] cchDuration

Size, in characters, of the buffer indicated by lpDurationStr.

Alternatively, the application can set this parameter to 0. In this case, the function retrieves NULL in lpDurationStr and returns the required size for the duration string buffer.

Return value

Returns the number of characters retrieved in the buffer indicated by lpDurationStr if successful. If lpDurationStr is set to NULL and cchDuration is set to 0, the function returns the required size for the duration string buffer, including the null terminating character. For example, if 10 characters are written to the buffer, the function returns 11 to include the terminating null character.

The function returns 0 if it does not succeed. To get extended error information, the application can call GetLastError, which can return one of the following error codes:

  • ERROR_INSUFFICIENT_BUFFER. A supplied buffer size was not large enough, or it was incorrectly set to NULL.
  • ERROR_INVALID_PARAMETER. Any of the parameter values was invalid.


See Remarks for GetDurationFormatEx.


Requirement Value
Minimum supported client Windows Vista [desktop apps only]
Minimum supported server Windows Server 2008 [desktop apps only]
Target Platform Windows
Header winnls.h (include Windows.h)
Library Kernel32.lib
DLL Kernel32.dll

See also





National Language Support

National Language Support Functions