Dates/Time Increments. help please.

[auswtz]

Hi really hope someone can help me.
I would like to get the amount of calls entering (successful + not successful) within 30mins interval but the data will also need to be be separated into weekdays/weekends.
So basically calls for weekdays needs to be entered into the Mon-Fri column and the weekends on Sat or Sun.
Any help or advice will be much appreciated.