Never.
They say that on that day all the planets will align with the sun and a meteor will go through all the planets including the sun
The planets do not align frequently. A perfect alignment of all planets in our solar system is very rare due to their different orbits and speeds of rotation. The last time all the planets aligned in a straight line was in 561 BC, and such a perfect alignment won't happen again for millions of years.
Rotational time of the planets is random (the length of the planet's day), but the outer planets do spin faster than the inner planets.
If it's a good day and the planets are aligned you might get by with a hundred dollars at the local alignment shop. Well, it works on mine, anyway.
The luminosity of the sky makes the planets undetectable. The Moon however can often be seen in the daytime because it's so bright.
planets have moons for day and night
what is meant by a planets day
The outer planets all rotate faster than the inner planets. Each of them has a rotational period shorter than an Earth day. All of the inner planets have rotational periods longer than one Earth day. The outer planets are mostly made up of hydrogen, helim, and ice, and they are much larger than the inner planets which are mostly iron and various types of rock.
A planets day (solar day) is the time it takes to rotate once on its axis relative to the sun, the synodic period. A year on a planet is the time taken for the planet travel once around the sun.
Planets have different day lengths due to variations in their rotation speeds and sizes. Planets closer to the Sun, like Mercury, have shorter day lengths because they rotate faster. Larger planets, such as Jupiter, have longer day lengths due to their slower rotation speeds.
Which planet?
The light of the sun is too bright to make out the planets during the day unless there is an eclipse.