What is time?Time is a measurable period during which an action, process, or condition exists or continues. It is often referred to as the fourth dimension, along with the three spatial dimensions. Time as a unit is any particular time interval, used as a standard way of measuring or expressing duration.
InputSecond is the base unit of time in the SI units that is equal to the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom.
Day is approximately the period of time during which the Earth completes one rotation around its axis.