I have 2 issues with date & time
1) how can I extract the name of the day from a date
example : 02/07/2010 => Friday
2) I' d like to count number of sales for an 30 minutes interval of time
example 8:00 to 8:30, 8:30 to 9:00, ......, 19:30 to 20:00
I do prefer solution using chart than script.
Thanks in advance for any help