On Mon, 3 Dec 2018 11:56:16 -0800 (PST), Gerald Kelleher
wrote:

Here is a new planet with instrumentation sent by humans with the necessity to create a timekeeping system with its own features that are not arbitrary like a leap day correction within a Martian year, a Martian 24 hour day/night cycle anchored to noon with an integer of hours reflecting 15 degrees geography/geometry and all the other things that work so well on Earth.

Martian time is likely to be based locally on martian solar time, with
periodic leap second corrections to keep it synchronized with the
variable rotation rate... just like on Earth.

In all technical matters, time on Mars will be the same as time on the
Earth, a count of SI seconds.