time-format.xsl

<?xml version="1.0" encoding="UTF-8" ?>

<xsl:stylesheet version="1.0"
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
  xmlns:exslt="http://exslt.org/common"
  xmlns:date="http://exslt.org/dates-and-times">

  <xsl:output method="html" encoding="utf-8" indent="no" media-type="text/html" />

  <xsl:template match="/">
    <ul>
      <xsl:apply-templates select="//api-v1-entities-event-item" />
    </ul>
  </xsl:template>

  <xsl:template match="api-v1-entities-event-item">
    <li>
      <xsl:value-of select="title" />
      <xsl:text>: </xsl:text>
      <xsl:call-template name="FormatTime">
        <xsl:with-param name="hour"   select="date:hour-in-day(start-time)" />
        <xsl:with-param name="minute" select="date:minute-in-hour(start-time)" />
      </xsl:call-template>
      <xsl:if test="end-time">
        <xsl:text> - </xsl:text>
        <xsl:call-template name="FormatTime">
          <xsl:with-param name="hour"   select="date:hour-in-day(end-time)" />
          <xsl:with-param name="minute" select="date:minute-in-hour(end-time)" />
        </xsl:call-template>
      </xsl:if>
    </li>

  </xsl:template>

  <xsl:template name="FormatTime">
    <xsl:param name="hour">0</xsl:param>
    <xsl:param name="minute">0</xsl:param>
    <xsl:variable name="paddedMinute">
      <xsl:if test="string-length($minute) = 1">
        <xsl:text>0</xsl:text>
      </xsl:if>
      <xsl:value-of select="$minute" />
    </xsl:variable>
    <xsl:choose>
      <xsl:when test="$hour &gt; 12">
        <xsl:value-of select="($hour - 12)" />:<xsl:value-of select="$paddedMinute" /><xsl:text>pm</xsl:text>
      </xsl:when>
      <xsl:otherwise>
        <xsl:value-of select="$hour" />:<xsl:value-of select="$paddedMinute" /><xsl:text>am</xsl:text>
      </xsl:otherwise>
    </xsl:choose>

  </xsl:template>

</xsl:stylesheet>