A "Moon" day is the period it takes to make one revolution on it's axis (or Sidereal rotation period) this is currently 27.321582 Earth days.
29.5 earth days
The lunar day is about 29 earth-days long.
28 days
1 "day" on the Moon = 29.5 days here on Earth.
A day on the Moon is 28 days because the Moon keeps one half turned towards the Earth. You can see which part of the Moon has sunlight by looking at it, the bright part is the place where it's day.
Roughly 29 days on earth is equal to one day on the moon.
Both the lunar day and month are 28 Earth days long.
It isn't. A "day on the Moon" is about 29.5 Earth days; a year is about 365 days.
A day on the moon is 29.5 Earth days. The moon takes 27.3 days to fully orbit the Earth. This is called a sidereal day.
If you stay in one place on the moon, then the sun rises, stays up for about 2 Earth weeks, then sets, and stays down for about another 2 Earth weeks. That makes a complete "day" on the moon as long as 27.3 earth-days.
The length of a "day" on the moon is 29 Earth days.
One complete lunar 'day' is about 29.5 Earth days. So any spot on the moon has the sun up in its sky and light for 14.7 Earth days, followed by the sun down and not in the sky and darkness for the next 14.7 Earth days.