DateHandlerMonth.php

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<?php
/*
 * @author Andreas Åkre Solberg <andreas.solberg@uninett.no>
 * @package SimpleSAMLphp
 */
class sspmod_statistics_DateHandlerMonth extends sspmod_statistics_DateHandler
{
    public function __construct($offset)
    {
        $this->offset = $offset;
    }

    public function toSlot($epoch, $slotsize)
    {
        $dsttime = $this->getDST($epoch) + $epoch;
        $parsed = getdate($dsttime);
        $slot = (($parsed['year'] - 2000) * 12) + $parsed['mon'] - 1;
        return $slot;
    }

    public function fromSlot($slot, $slotsize)
    {
        $month = ($slot % 12);
        $year = 2000 + floor($slot / 12);
        return mktime(0, 0, 0, $month + 1, 1, $year);
    }

    public function prettyHeader($from, $to, $slotsize, $dateformat)
    {
        $month = ($from % 12) + 1;
        $year = 2000 + floor($from / 12);
        return $year . '-' . $month;
    }
}