COleDateTime::m_status
Remarks
The type of this data member is the enumerated type DateTimeStatus, which is defined within the COleDateTime class.
enum DateTimeStatus{
valid = 0,
invalid = 1,
null = 2,
};
For a brief description of these status values, see the following list:
COleDateTime::valid Indicates that this COleDateTime object is valid.
COleDateTime::invalid Indicates that this COleDateTime object is invalid; that is, its value may be incorrect.
COleDateTime::null Indicates that this COleDateTime object is null, that is, that no value has been supplied for this object. (This is “null” in the database sense of “having no value,” as opposed to the C++ NULL.)
The status of a COleDateTime object is invalid in the following cases:
If its value is set from a VARIANT or COleVariant value that could not be converted to a date/time value.
If its value is set from a time_t, SYSTEMTIME, or FILETIME value that could not be converted to a valid date/time value.
If its value is set by SetDateTime with invalid parameter values.
If this object has experienced an overflow or underflow during an arithmetic assignment operation, namely, += or -=.
If an invalid value was assigned to this object.
If the status of this object was explicitly set to invalid using SetStatus.
For more information about the operations that may set the status to invalid, see the following member functions:
Caution This data member is for advanced programming situations. You should use the inline member functions GetStatus and SetStatus. See SetStatus for further cautions regarding explicitly setting this data member.
For more information about the bounds for COleDateTime values, see the article in Visual C++ Programmer’s Guide.