Summons from court of law

Few years back I realized the importance of punctuality in the court of Additional Session Judge Delhi when the honorable judge asked me to look at my watch to point out that I was late by two minutes…Why?…Is it not a contempt of court? I was appearing as a medical witness for the Delhi Police, in response to a summon, in the Shivani Bhatnagar murder case, a journalist of Indian Express, whose postmortem was conducted by me.