First Sun in Month Auto Patch Deploy Patches installs on random day of week?

First Sun in Month Auto Patch Deploy Patches installs on random day of week?

Hi
I was wondering why when I choose to Auto deploy my patches on 'The First Sun' in the month on all months does the schedule say it will next run on a Thursday?
 
For example, I have a schedule to deploy patches to PCs and laptops on the 'First Sun' at 04:00 on every month of the year. When i take a look at the 'Next Run Time' of schedule it says 30th July 2010 which is a Fri?
 
Has anyone seen this before and how do I get around this because I really would like to only install patches on a Sun in the month.
 
Thanks

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