# formatted dates

function today(fmt,    year, month, day,    date, str) {
    if (0 < year + 0 && year + 0 < 10000 &&
        0 < month + 0 && month + 0 <= 12 &&
        0 < day + 0 && day + 0 <= 31) {
            str = "-d \"" month "/" day "/" year "\"" }
    "date +\"" fmt "\" " str | getline date
    return date }