convert date to roman numerals

filename="blocked_$(date +%Y_%m_%d | sed 's/[0-9]\+/convert_to_roman &/g' | bash).log"

# Helper function (place this in your shell script or .bashrc)
convert_to_roman() {
  number=$1
  roman=""
  declare -A numerals=(
    [1000]=M [900]=CM [500]=D [400]=CD [100]=C [90]=XC
    [50]=L [40]=XL [10]=X [9]=IX [5]=V [4]=IV [1]=I
  )
  for value in "${!numerals[@]}"; do
    while (( number >= value )); do
      roman+="${numerals[$value]}"
      (( number -= value ))
    done
  done
  echo -n "$roman"
}