adjustement for a medication time.

  1. I 'd like to know if there is any policy regarding the adjustement of a medication time for a pediatric patient. for example my patient will start on "X" medication Q 6hours the timing policy of my institution is 1am 1pm 7am 7pm. the dose was prescribed at 3pm so i started the dose at 3pm how should i adjust the timing of this medication to coincide with my hospital policy?. are there any guidelines related to this issue that can be of further help to me.
    Thank you.