Iplot Text Substitutions - Last Saved Date

I am trying to find out how to get a text subtitution in Iplot that will recognize the last "save date" for a design file.  I can do it easily in the Microstation Pen Table but I can't write it for Iplot.

 

MS Pen table...._LASTSAVEDDATE_

Iplot... ???????

Any ideas would be very helpful or a Microstation .tbl to Iplot Design Script text substitution guide.

Thanks,

Kevin