Update-TypeData -TypeName 'System.DateTime' -MemberName '时辰' -MemberType 'ScriptProperty' -Value {
  $timeAliasArray='子丑寅卯辰巳午未申酉戌亥'
  $hour = $this.Hour
  [int]$index=0
  if($hour -eq 22){ $index=11 }
  else{
    $index=[math]::Floor( ( $hour+1 ) % 23 / 2 )
     }
 return $timeAliasArray[ $index ] + "时"
}

PS> (get-date).时辰
子时
PS> $t=Get-Date -Hour 17
PS> $t.时辰
酉时