diff --git a/inc/class.section_meeting.inc b/inc/class.section_meeting.inc
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+++ b/inc/class.section_meeting.inc
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+<?php
+
+/**
+ * \brief
+ *   Represent a time/location that a Section meets during/at.
+ *
+ * A Calvin student might ask ``Why is there a need for a
+ * SectionMeeting class? Doesn't every Section have a unique
+ * prof/time/location?'' A Cedarville student would retort ``Huh?
+ * Don't some of your classes have labs in addition to lecture? How do
+ * you know that you have to go to both a lecture and lab -- and how
+ * do you handle that some classes have different lecture times for
+ * different days of the week?''. A Calvin section _is_ a unique
+ * prof/time/location. At Cedarville, a Section refers to a prof and a
+ * _set_ of time/location pairs. The generalization is to make each
+ * Section support a list of meeting times/locations.
+ */
+class SectionMeeting
+{
+  private $time_start;
+  private $time_end;
+
+  private $days;
+
+  private $location;
+
+  /**
+   * \brief
+   *   Construct a SectionMeeting.
+   *
+   * \param $days
+   *   A string of single-char day upon which a section meets. Monday
+   *   is represented with 'm', Tuesday with 't', Wednesday with 'w',
+   *   Thursday with 'h', and Friday with 'f'.
+   * \param $time_start
+   *   The time of day when the section meeting starts.
+   * \param $time_end
+   *   The time of day when the section meeting ends.
+   * \param $location
+   *   Where the meeting occurs. Often a room number of some sort.
+   * \param $type
+   *   The type of meeting this is. For lectures, please use
+   *   'lecture'. For labs, please use 'lab'. For others, use the
+   *   school's notation.
+   */
+  public function __construct($days, $time_start, $time_end, $location = NULL, $type = 'lecture')
+  {
+    $this->days_set($days);
+
+    $this->time_start = $time_start;
+    $this->time_end = $time_end;
+
+    $this->location = $location;
+
+    $this->type = $type;
+  }
+
+  /**
+   * \brief
+   *   Take a days of week string and store it into our $days of week array.
+   *
+   * \param $days_str
+   *   The days of the week in a string format. One char per
+   *   day. Mon-Fri is represented with 'm', 't', 'w', 'h', 'f'.
+   */
+  private function days_set($days_str)
+  {
+    $this->days = array(0 => FALSE, 1 => FALSE, 2 => FALSE, 3 => FALSE, 4 => FALSE);
+
+    $days_str_strlen = strlen($days_str);
+    for ($i = 0; $i < $days_str_strlen; $i ++)
+      $this->days[self::day_atoi($days_str[$i])] = TRUE;
+  }
+
+  /**
+   * \brief
+   *   Convert a day letter to a day numeral.
+   *
+   * Works fine if you give the numeral as well.
+   */
+  private static function day_atoi($day_c)
+  {
+    static $day_atoi = array('m' => 0, 't' => 1, 'w' => 2, 'h' => 3, 'f' => 4,
+			     'M' => 0, 'T' => 1, 'W' => 2, 'H' => 3, 'F' => 4,
+			       0 => 0,   1 => 1,   2 => 2,   3 => 3,   4 => 4);
+
+    return $day_atoi[$day_c];
+  }
+
+  /**
+   * \brief
+   *   Determine whether or not this class meeting time meets on a
+   *   specified day of the week or not.
+   *
+   * \param $day
+   *   The letter or numeral of the day to retrieve.
+   * \return
+   *   TRUE if this section meeting meets on that day. FALSE
+   *   otherwise.
+   */
+  public function getDay($day)
+  {
+    return $this->days[self::day_atoi($day)];
+  }
+
+  /**
+   * \return
+   *   This SectionMeeting's location or NULL if none is defined.
+   */
+  public function getLocation()
+  {
+    return $this->location;
+  }
+
+  /**
+   * \brief
+   *   Get the start_time of this meeting in slate_permutate's internal format.
+   */
+  public function getStartTime()
+  {
+    return $this->time_start;
+  }
+
+  public function getEndTime()
+  {
+    return $this->time_end;
+  }
+
+  /**
+   * \brief
+   *   Check if this section conflicts with the given section.
+   *
+   * \param $that
+   *   The other section for which I should check for conflicts.
+   * \return
+   *   TRUE if there is a conflict, FALSE otherwise.
+   */
+  public function conflictsWith(SectionMeeting $that)
+  {
+    /*
+     * The two sections meetings can't conflict if the start/end times
+     * don't overlap. Also, use >= or <= here so that one can say ``I
+     * have gym from 10 through 11 and then latin from 11 though 12''.
+     */	
+    if ($this->getStartTime() >= $that->getEndTime()
+	|| $this->getEndTime() <= $that->getStartTime())
+      {
+	return FALSE;
+      }
+
+    /*
+     * Now we know that the sections meetings overlap in start/end
+     * times. But if they don't both meet on the same day at least
+     * once, they don't conflict.
+     */
+    for ($day = 0; $day < 5; $day ++)
+      {
+	if ($this->getDay($day) && $that->getDay($day))
+	  return TRUE;
+      }
+
+    /*
+     * The sections meetings don't both share a day of the week.
+     */
+    return FALSE;
+  }
+
+  /**
+   * \brief
+   *   Return an array of JSON keys specific to this section meeting
+   *   time.
+   *
+   * Currently, the AJAX UI doesn't recognize that a given section may
+   * have multiple meeting times. Thus, we simulate this by having
+   * multiple instances of the same section but just with different
+   * times in the UI.
+   */
+  public function to_json_array()
+  {
+    static $daymap = array(0 => 'm', 1 => 't', 2 => 'w', 3 => 'h', 4 => 'f');
+
+    $json_array = array(
+			'time_start' => $this->time_start,
+			'time_end' => $this->time_end,
+			'days' => array(),
+			'location' => $this->location,
+			);
+
+    for ($day = 0; $day < 5; $day ++)
+      $json_array['days'][$daymap[$day]] = $this->getDay($day);
+
+    return $json_array;
+  }
+}