The dash indication just a timer based on time/mileage so is often incorrectly set by dealer, e.g. the clock starts ticking at PDI which may be several months before a customer takes delivery of the car.
Service schedule advises the service interval should be calculated from first use, rather than PDI so e.g. if car is built August 17, PDI September 17 but not delivered until Dec 17 service is due Dec 18/10K Miles if on time/distance regime.