Weekly Date based on Sundays


I am trying to find a way to automate a date that right now I have to change manually every week on a website I maintain. It is for a church and I want to find a way to use a script to put the week based on the latest Sunday on the site. i.e. Week of Sunday December 8, 2007 for the entire week and then and have it change to Week of Sunday December 15, 2007 the next Sunday for the week and so on. I cannot figure out how to do it myself and I have not been able to find a script that does anything like it. Any one have any thoughts or a hint on how to accomplish this in php 5?

Many thanks,