#!/usr/bin/env bash

# current date in ISO format
if [ $# -eq 0 ]; then
	echo -e "$(date '+%Y-%m-%d')"
fi

# if you also want time then supply `time` arg:
# today time
if [ "$1" == "time" ]; then
	echo -e "$(date '+%Y-%m-%d_%I:%M%p')"
fi