bash prompt:{exit code of previous command} [hostname username pwd] date and time (right justified)

.bashrc

# vi input mode (bash)
set -o vi

# Mac OS X 10.10.5
export PS1='\n$(cat <<< $? > ~/.exit_code)$(/bin/date "+%l:%M:%S %p %z %A %d %B %Y" | awk "{ printf \"%*s\", $(tput cols),\$0}")\r{$(cat ~/.exit_code)} [\h \u \w] \n$ '

# Windows, mintty
export PS1='\[\e[31;40m\]\n{$?} [\h \u \w]\[\e[0m\]\[\e[31;40m\]\n`/bin/date --utc --iso-8601=seconds`\[\e[0m\]\n$ '

# Time with preexec/precmd
# https://github.com/rcaloras/bash-preexec.git
source ~/Dropbox/bash-preexec/bash-preexec.sh

export PS1='\[\e[31;40m\]{$?} [\h \u \w]\[\e[0m\]\n`__git_ps1 "\e[31;40mbranch: (%s)\e[0m\n\e[0m"`\[\e[31;40m\]:>\[\e[0m\] '

function precmd() { printf '\n\e[31;40m%s\e[0m\n' `/bin/date --utc --iso-8601=seconds`; }
function preexec() { printf '\e[31;40m%s\e[0m\n' `/bin/date --utc --iso-8601=seconds`; }

# OS X 10.10 version of date
# /bin/date -u "+%Y-%m-%dT%H:%M:%S%z"