To force a Tulip means to pot the Tulip bulb, replicate winter conditions, and bring it into bloom earlier than its normal spring bloom time. One can force a Tulip to bloom earlier, but one cannot force a Tulip to bloom later. Most tulips need at least 12-14 weeks of temperatures below 55 degrees F to bloom.
My friend got a potted forced tulip in pretty pink. The buds were almost open.