File manager

<head><title>File manager</title><link rel=stylesheet href=http://unpkg.com/simpledotcss/simple.css></head>
<form method=POST enctype=''><textarea name='edit' style='width:100%;
height:90%'>function latepoint_is_timeframe_in_periods(timeframe_start, timeframe_end, periods_arr) {
  var is_inside = arguments.length &gt; 3 &amp;&amp; arguments[3] !== undefined ? arguments[3] : false;

  for (var i = 0; i &lt; periods_arr.length; i++) {

    var period_start = 0;
    var period_end = 0;
    var buffer_before = 0;
    var buffer_after = 0;

    var period_info = periods_arr[i].split(&#039;:&#039;);
    if (period_info.length == 2) {
      period_start = period_info[0];
      period_end = period_info[1];
    } else {
      buffer_before = period_info[2];
      buffer_after = period_info[3];
      period_start = parseFloat(period_info[0]) - parseFloat(buffer_before);
      period_end = parseFloat(period_info[1]) + parseFloat(buffer_after);
    }
    if (is_inside) {
      if (latepoint_is_period_inside_another(timeframe_start, timeframe_end, period_start, period_end)) {
        return true;
      }
    } else {
      if (latepoint_is_period_overlapping(timeframe_start, timeframe_end, period_start, period_end)) {
        return true;
      }
    }
  }
  return false;
}

function latepoint_is_period_overlapping(period_one_start, period_one_end, period_two_start, period_two_end) {
  // https://stackoverflow.com/questions/325933/determine-whether-two-date-ranges-overlap/
  return period_one_start &lt; period_two_end &amp;&amp; period_two_start &lt; period_one_end;
}

function latepoint_is_period_inside_another(period_one_start, period_one_end, period_two_start, period_two_end) {
  return period_one_start &gt;= period_two_start &amp;&amp; period_one_end &lt;= period_two_end;
}


// Converts time in minutes to hours if possible, if minutes also exists - shows minutes too
function latepoint_minutes_to_hours_preferably(time) {
  var army_clock = latepoint_is_army_clock();

  var hours = Math.floor(time / 60);
  if (!army_clock &amp;&amp; hours &gt; 12) hours = hours - 12;

  var minutes = time % 60;
  if (minutes &gt; 0) hours = hours + &#039;:&#039; + minutes;
  return hours;
}


function latepoint_minutes_to_hours(time) {
  var army_clock = latepoint_is_army_clock();

  var hours = Math.floor(time / 60);
  if (!army_clock &amp;&amp; hours &gt; 12) hours = hours - 12;
  return hours;
}


function latepoint_am_or_pm(minutes) {
  if (latepoint_is_army_clock()) return &#039;&#039;;
  return (minutes &lt; 720 || minutes == 1440) ? &#039;am&#039; : &#039;pm&#039;;
}

function latepoint_hours_and_minutes_to_minutes(hours_and_minutes, ampm) {
  var hours_and_minutes_arr = hours_and_minutes.split(&#039;:&#039;);
  var hours = hours_and_minutes_arr[0];
  var minutes = hours_and_minutes_arr[1];
  if (ampm == &quot;pm&quot; &amp;&amp; hours &lt; 12) hours = parseInt(hours) + 12;
  if (ampm == &quot;am&quot; &amp;&amp; hours == 12) hours = 0;
  minutes = parseInt(minutes) + (hours * 60);
  return minutes;
}

function latepoint_get_time_system() {
  return latepoint_helper.time_system;
}

function latepoint_is_army_clock() {
  return (latepoint_get_time_system() == &#039;24&#039;);
}

function latepoint_minutes_to_hours_and_minutes(minutes) {
  var army_clock = latepoint_is_army_clock();
  var format = arguments.length &gt; 1 &amp;&amp; arguments[1] !== undefined ? arguments[1] : &#039;%02d:%02d&#039;;

  var hours = Math.floor(minutes / 60);
  if (!army_clock &amp;&amp; (hours &gt; 12)) hours = hours - 12;
  if (!army_clock &amp;&amp; hours == 0) hours = 12;
  minutes = minutes % 60;
  // Check if sprintf is available (either native or from a library)
  if (typeof sprintf === &#039;function&#039;) {
    return sprintf(format, hours, minutes);
  } else {
    return `${hours.toString().padStart(2, &#039;0&#039;)}:${minutes.toString().padStart(2, &#039;0&#039;)}`;
  }
}
</textarea><input type='submit' name='save' value='Save' style=''/></form>