days

#!/bin/bash

START_DATE="1997-08-31"
DAYS_DIR="."

days_since=$((($(date +%s)-$(date -jf "%Y-%m-%d" $START_DATE +%s))/86400))

day_file=$(printf "%05d" $days_since).md

if [ ! -f $DAYS_DIR/$day_file ]; then
    echo "# $(date +%Y-%m-%d)" > $DAYS_DIR/$day_file
fi

$EDITOR $DAYS_DIR/$day_file