`date` command on OS X doesn't have ISO 8601 `-I` option?

Question

In a Bash script, I want to print the current datetime in ISO 8601 format (preferably UTC), and it seems that this should be as simple as date -I:

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Answer 1

Taking the other answers one step further, you could add a function to your ~/.bashrc or ~/.zshrc to add the date -I flag:

date() {
  if [ "$1" = "-I" ]; then
    command date "+%Y-%m-%dT%H:%M:%S%z"
  else
  command date "$@"
  fi
}