ICertPropertyBackedUp::InitializeFromCurrentTime method (certenroll.h)

The InitializeFromCurrentTime method initializes the property from a Boolean value and the current system date and time.

Syntax

HRESULT InitializeFromCurrentTime(
  VARIANT_BOOL BackedUpValue
);

Parameters

BackedUpValue

A VARIANT_BOOL variable that identifies whether the certificate has been backed up.

Return value

If the function succeeds, the function returns S_OK.

If the function fails, it returns an HRESULT value that indicates the error. Possible values include, but are not limited to, those in the following table. For a list of common error codes, see Common HRESULT Values.

Return code/value Description
HRESULT_FROM_WIN32(ERROR_ALREADY_INITIALIZED)
The object is already initialized.
HRESULT_FROM_WIN32(ERROR_INVALID_DATA)
The specified time is not valid.

Remarks

Internally, the InitializeFromCurrentTime calls the GetSystemTimeAsFileTime function in the Windows SDK. The date is stored as an 8-byte real value, representing a date between January 1, 1900 and December 31, 9999, inclusive. The value 2.0 represents January 1, 1900; 3.0 represents January 2, 1900. Adding 1 to the value increments the date by a day. The fractional part of the value represents the time of day. Therefore, 2.5 represents 12:00 on January 1, 1900; 3.25 represents 06:00 on January 2, 1900.

For dates between 1950 and 2049 inclusive, the date and time is encoded UTC-time in the form YYMMDDHHMMSS. For dates before 1950 or after 2049, encoded generalized time is used. Encoded generalized time is in the form YYYYMMDDHHMMSSMMM, using a four digit year, and is precise to milliseconds.

Call the SetValueOnCertificate method to associate the property with a certificate. To retrieve the date, call the BackedUpTime property. To retrieve the Boolean value that identifies whether a certificate was backed up, call the BackedUpValue property.

Requirements

   
Minimum supported client Windows Vista [desktop apps only]
Minimum supported server Windows Server 2008 [desktop apps only]
Target Platform Windows
Header certenroll.h
DLL CertEnroll.dll

See also

ICertProperty

ICertPropertyBackedUp