gsettings get com.canonical.indicator.datetime time-format
gsettings get com.canonical.indicator.datetime custom-time-format
gsettings set com.canonical.indicator.datetime time-format custom && gsettings set com.canonical.indicator.datetime custom-time-format "%a %b %e, %l:%M %p"
gsettings reset com.canonical.indicator.datetime time-format && gsettings reset com.canonical.indicator.datetime custom-time-format
date --help
gsettings set com.canonical.indicator.datetime time-format custom && gsettings set com.canonical.indicator.datetime custom-time-format "%a %x %H:%M"