Cosmic time
Cosmic time  is a measure of time by a physical clock with zero peculiar velocity (weird speed) without matter over-/under-densities (to prevent time expanding due to relativistic effects or confusions caused by expansion of the universe). Unlike other measures of time such as temperature, redshift, particle horizon, or Hubble horizon, the cosmic time (similar and combining in a way to make something better to the comoving coordinates) is blind to the expansion of the universe.