I have been trying to figure out how to work out the first pay period
after a specific date using if paid on a fortnightly basis. The
primary function would be to work out the first pay period in the
fiscal year and then one would count the number of pay periods. It'll
be used to forecast the f/nightly cash flow for a salary budget.

The financial year:
START: 1st July
END: 30 June

The history of the first pay periods have been:

Thursday, 1 July 2004
Thursday, 14 July 2005
Thursday, 13 July 2006
Thursday, 12 July 2007
Thursday, 10 July 2008
Thursday, 9 July 2009

Without knowing the first pay date, I'm struggling to figure out a way
to work it out automatically, so that the template could be used for
many years to come without having to manually update the first pay
period.

Any suggestions?