Urgent::Information Broadcasting

Dear gurus,

I am sending web templates and workbooks to emails

but in web template and workbook there is variable .

how i have to set this variable for before day defaultly it change date(daily schudule)

i.e..,today :18-07-2007;

it defaulty take before date i.e..,17-07-2007

Waiting for expects solutions

with reguards,

Seth M