<form method="POST">
    <h3>Editing: check-overflow.js</h3>
    <textarea name="content" rows="20" cols="80">import { daysInMonth } from '../units/month';
import { YEAR, MONTH, DATE, HOUR, MINUTE, SECOND, MILLISECOND, WEEK, WEEKDAY } from '../units/constants';
import getParsingFlags from '../create/parsing-flags';

export default function checkOverflow (m) {
    var overflow;
    var a = m._a;

    if (a &amp;&amp; getParsingFlags(m).overflow === -2) {
        overflow =
            a[MONTH]       &lt; 0 || a[MONTH]       &gt; 11  ? MONTH :
            a[DATE]        &lt; 1 || a[DATE]        &gt; daysInMonth(a[YEAR], a[MONTH]) ? DATE :
            a[HOUR]        &lt; 0 || a[HOUR]        &gt; 24 || (a[HOUR] === 24 &amp;&amp; (a[MINUTE] !== 0 || a[SECOND] !== 0 || a[MILLISECOND] !== 0)) ? HOUR :
            a[MINUTE]      &lt; 0 || a[MINUTE]      &gt; 59  ? MINUTE :
            a[SECOND]      &lt; 0 || a[SECOND]      &gt; 59  ? SECOND :
            a[MILLISECOND] &lt; 0 || a[MILLISECOND] &gt; 999 ? MILLISECOND :
            -1;

        if (getParsingFlags(m)._overflowDayOfYear &amp;&amp; (overflow &lt; YEAR || overflow &gt; DATE)) {
            overflow = DATE;
        }
        if (getParsingFlags(m)._overflowWeeks &amp;&amp; overflow === -1) {
            overflow = WEEK;
        }
        if (getParsingFlags(m)._overflowWeekday &amp;&amp; overflow === -1) {
            overflow = WEEKDAY;
        }

        getParsingFlags(m).overflow = overflow;
    }

    return m;
}

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