you can't use cluster. consult the detail help.
2D data contains the single-precision numbers the VI writes to the file if 1D data is not wired or is empty.
1D data contains the single-precision numbers the VI writes to the file if this input is not empty. The VI converts the 1D array into a 2D array before proceeding. If transpose? is FALSE, each call to this VI creates a new line or row in the file.
The follow code only show you how to connect the 'write to spreadsheet file.vi' , you still need edit this vi to convert a time-string to a number.