Retrieves the modification time of a vault item.
QDateTime GetFileModificationTime(const QString& qsFileName);
This method retrieves the modification time of the vault item (file, directory, symbolic link, or alternate stream) specified by FileName. The timestamps returned by this method are specified in UTC.
The value passed for FileName must be a vault-local absolute path.
Note: This method can only be called when Active is true.
This method returns a Long64 value; after it returns, call the GetLastErrorCode() method to obtain its result code; 0 indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the GetLastError() method can be called to retrieve the associated error message.