asciiClock.ps1

#
# PowerShell v3
#

$template ="
input
_IN_
output
         0
    b         1

 a               2

9                 3

 8               4

    7         5
         6"

filter Get-Clock {
    $d = Get-Date $_
    $h = "{0:x}" -f ($d.Hour % 12)
    $m = "{0:x}" -f ([Math]::Round($d.Minute / 5) -as [int])
    $t = $template
    ($h,"X"),($m,"x"),("[\dab]","o"),("_IN_",$_) | % { $t = $t -replace $_ }
    $t
}

"18:35","00:00","10:03" | Get-Clock



# [Result]
#
# input
# 18:35
# output
#          o
#     o         o
# 
#  o               o
# 
# o                 o
# 
#  o               o
# 
#     x         o
#          X
# 
# input
# 00:00
# output
#          X
#     o         o
# 
#  o               o
# 
# o                 o
# 
#  o               o
# 
#     o         o
#          o
# 
# input
# 10:03
# output
#          o
#     o         x
# 
#  X               o
# 
# o                 o
# 
#  o               o
# 
#     o         o
#          o