Standard deviation and Skweness of time series data

I have a data set (below is the sample) and want to estimate "standard deviation" and "skewness" of "Return" based on date. I can see in Sub-total, there is only "standard deviation" function, but not Skweness. Could you help me providing "Macro" for this calculation or any other option to add function "skew" in Subtotal under data.

Thank yo very much.

Rajesh


date oibs Return
20080102 -3281480 0.045779685
20080102 3701288 -0.003191974
20080102 -979103 0.006861848
20080103 7579598 0.006360745
20080103 -10602024 0.015801354
20080103 -10291866 -0.017777778
20080103 -2209667 -0.003167421
20080104 -1288131 0.003177485
20080104 7216439 -0.005429864
20080104 3996540 0.002274795
20080104 3317700 0.003631412
20080107 2329587 0.003579418
20080107 14580393 0.011145787
20080107 13219705 0.012786596
20080108 -7031765 0.002612103
20080108 2963773 -0.023013461
20080108 -15267897 0.009333333
20080108 -9512493 -0.021576398
20080109 5515837 -0.00540054
20080109 20544167 0.010775318
20080109 35572497 0.026951176

Thank you very much. But you see I want to estimate for daily data.. like 20080102 , 20080103 separately. As I am a beginners, can you write me full formula.. thank you.