Filter view results by day of the week instead of the date - Date Module
I think you have to use the Views Day of Week module to filter the result by day of week. Here is a quote from it's project page:

... Views Day of Week provides a simple filter plugin for Views 3 to enable filtering content that should be visible based on the current day of the week.
Example: With this module you can select that some content should be visible only on Mondays, some on Tuesdays and Thursdays and some only on Fridays.