Preheat oven to 325°.
To prepare crust, lightly spoon 1 cup flour into a dry measuring cup; level with a knife. Combine 1/4 cup flour, water, and juice, stirring with a whisk until well blended to form a slurry.
Combine 3/4 cup flour, powdered sugar, and 1/4 teaspoon salt; cut in shortening with a pastry blender or 2 knives until mixture resembles coarse meal. Add slurry; toss with a fork until mixture is moist. Gently press mixture into a 4-inch circle on 2 sheets of heavy-duty plastic wrap that overlap; cover with two additional sheets of overlapping plastic wrap. Roll dough, still covered, into a 12-inch circle; freeze 10 minutes.
Remove top 2 sheets of plastic wrap; let dough stand 1 minute or until pliable. Fit dough, plastic-wrap side up, into a 9-inch pie plate coated with cooking spray. Remove remaining plastic wrap. Press dough into bottom and up sides of pan. Fold edges under; flute.
To prepare filling, sprinkle dates and pecans evenly over bottom of crust. Combine corn syrup and remaining ingredients in a large bowl; beat with a mixer at medium speed until well blended. Pour mixture into prepared crust. Bake at 325° for 55 minutes or until a knife inserted 1 inch from the edge comes out clean. Cool on a wire rack.