Local Planetary Time

Local Planetary Time was a forerunner of stardates.

The system came about when colonists on Mars needed to reconcile Martian sols with Earth] hours. A council of religious scholars on Mars came up with Local Planetary Time, which was based on Vulcan look-up tables and charts that Vulcan ships had been using to keep their time that of. When Humanity began to colonises more planets and send starships on longer missions, Local Planetary Time was supplanted by stardates.