A new and distinct cultivar of Dahlia plant named `DASEKSTEN` characterized by ray floret color (fully opened): upper side: near base, yellow, RHS 9A transitioning to orange-red, RHS N30C; capitulum (composite flower head): 8.5 cm in diameter, with a large number of ray florets (about 110 to 150); foliage: mature leaves are up to 12 cm in length, mostly compound, with 2 to 3 elliptic leaflets; and plant vigor and growth habit: Moderately vigorous, grows upright and is globular in shape.