SQL Stored Proceudrer Datetime

Is there away to do this in SQL Server Stored Procedure. I am basically trying to determine full datetime pay period base upon date time now for two weeks using the formula below. It works in code. But I need to do it in a query for a filter purpose. The payperiod variable is 14 days.

DateTime baseDate = Properties.Settings.Default.BaseDate; // new DateTime(2010, 12, 25);
TimeSpan ts = DateTime.Today - baseDate;
int numOfDaysDiff = ts.Days;

int numOfBiWeeks = numOfDaysDiff / Properties.Settings.Default.PayPeriodDays;

periodStart = baseDate.AddDays(numOfBiWeeks * Properties.Settings.Default.PayPeriodDays);
periodEnd = periodStart.AddDays(Properties.Settings.Default.PayPeriodDays - 1);