Rounding Up / Down Half Class Level

Does a "half class level" (or "two-third class level") proficiency / ability get rounded up or down? What about at 1st level?

As an example, does turn undead with half class round up or down at 3rd level? Does he get full cleric turning at 1st level if he gets the proficiency / ability at 1st level?

Worked it out myself! Round up!