Time changes relative to speed and gravity. it moves slightly faster on the Moon because of its weaker gravity. The small difference in time could have large effects on calculations made in space.
Time zone
NASA confirms it’s developing the Moon’s new time zone
NASA confirmed on Friday that it will create a new lunar time system for the Moon. The White House published a policy memo in April, directing NASA to create the new standard by 2026.
https://www.engadget.com/science/space/nasa-confirms-its-developing-the-moons-new-time-zone-165345568.html

Seonglae Cho