Beat butter and sugars at med. speed with electric mixer until light and fluffy. Reduce speed to low and add flour, baking soda, vanilla, salt , cinnamon and eggs. Mix just until blended, scraping bowl occasionally. With spoon, stir in oats, dates and pecans.
Drop cookie dough by level 1/4 cup 3 inches apart on ungreased cookie sheets.
Bake cookies for about 20 to 25 minutes in a 350°F preheated oven.