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GetCalendarInfo function

Retrieves information about a calendar for a locale specified by identifier.

Note  For interoperability reasons, the application should prefer the GetCalendarInfoEx function to GetCalendarInfo 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 GetCalendarInfoEx.


int GetCalendarInfo(
  _In_      LCID    Locale,
  _In_      CALID   Calendar,
  _In_      CALTYPE CalType,
  _Out_opt_ LPTSTR  lpCalData,
  _In_      int     cchData,
  _Out_opt_ LPDWORD lpValue


Locale [in]

Locale identifier that specifies the locale for which to retrieve calendar information. You can use the MAKELCID macro to create a locale identifier or use one of the following predefined values.

Calendar [in]

Calendar identifier.

CalType [in]

Type of information to retrieve. For more information, see Calendar Type Information.

Note  GetCalendarInfo returns only one string if this parameter specifies CAL_IYEAROFFSETRANGE or CAL_SERASTRING. In both cases the current era is returned.

CAL_USE_CP_ACP is relevant only for the ANSI version of this function.

For CAL_NOUSEROVERRIDE, the function ignores any value set by SetCalendarInfo and uses the database settings for the current system default locale. This type is relevant only in the combination CAL_NOUSEROVERRIDE | CAL_ITWODIGITYEARMAX. CAL_ITWODIGITYEARMAX is the only value that can be set by SetCalendarInfo.

lpCalData [out, optional]

Pointer to a buffer in which this function retrieves the requested data as a string. If CAL_RETURN_NUMBER is specified in CalType, this parameter must retrieve NULL.

cchData [in]

Size, in characters, of the lpCalData buffer. The application can set this parameter to 0 to return the required size for the calendar data buffer. In this case, the lpCalData parameter is not used. If CAL_RETURN_NUMBER is specified for CalType, the value of cchData must be 0.

lpValue [out, optional]

Pointer to a variable that receives the requested data as a number. If CAL_RETURN_NUMBER is specified in CalType, then lpValue must not be NULL. If CAL_RETURN_NUMBER is not specified in CalType, then lpValue must be NULL.

Return value

Returns the number of characters retrieved in the lpCalData buffer, with cchData set to a nonzero value, if successful. If the function succeeds, cchData is set to 0, and CAL_RETURN_NUMBER is not specified, the return value is the size of the buffer required to hold the calendar information. If the function succeeds, cchData is set 0, and CAL_RETURN_NUMBER is specified, the return value is the size of the value retrieved in lpValue, that is, 2 for the Unicode version of the function or 4 for the ANSI version.

This 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_FLAGS. The values supplied for flags were not valid.
  • ERROR_INVALID_PARAMETER. Any of the parameter values was invalid.


When the ANSI version of this function is used with a Unicode-only locale identifier, the function can succeed because the operating system uses the system code page. However, characters that are undefined in the system code page appear in the string as a question mark (?).


Minimum supported client

Windows 2000 Professional [desktop apps only]

Minimum supported server

Windows 2000 Server [desktop apps only]


Winnls.h (include Windows.h)





Unicode and ANSI names

GetCalendarInfoW (Unicode) and GetCalendarInfoA (ANSI)

See also

National Language Support
National Language Support Functions
Calendar Type Information



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