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<?php
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namespace PhpXmlRpc\Helper;
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use PhpXmlRpc\PhpXmlRpc;
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/**
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 * Helps to convert timestamps to the xml-rpc date format.
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 *
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 * Feature creep -- add support for custom TZs
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 */
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class Date
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{
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    /**
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     * Given a timestamp, return the corresponding ISO8601 encoded string.
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     *
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     * Really, timezones ought to be supported but the XML-RPC spec says:
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     *
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     * "Don't assume a timezone. It should be specified by the server in its documentation what assumptions it makes
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     *  about timezones."
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     *
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     * This routine always encodes to local time unless $utc is set to 1, in which case UTC output is produced and an
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     * adjustment for the local timezone's offset is made
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     *
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     * @param int|\DateTimeInterface $timet timestamp or datetime
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     * @param bool|int $utc (0 or 1)
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     * @return string
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     */
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    public static function iso8601Encode($timet, $utc = 0)
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    {
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        if (is_a($timet, 'DateTimeInterface') || is_a($timet, 'DateTime')) {
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            $timet = $timet->getTimestamp();
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        }
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        if (!$utc) {
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            $t = date('Ymd\TH:i:s', $timet);
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        } else {
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            $t = gmdate('Ymd\TH:i:s', $timet);
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        }
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        return $t;
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    }
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    /**
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     * Given an ISO8601 date string, return a timestamp in the localtime, or UTC.
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     *
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     * @param string $idate
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     * @param bool|int $utc either 0 (assume date is in local time) or 1 (assume date is in UTC)
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     *
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     * @return int (timestamp) 0 if the source string does not match the xml-rpc dateTime format
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     */
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    public static function iso8601Decode($idate, $utc = 0)
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    {
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        $t = 0;
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        if (preg_match(PhpXmlRpc::$xmlrpc_datetime_format, $idate, $regs)) {
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            if ($utc) {
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                $t = gmmktime($regs[4], $regs[5], $regs[6], $regs[2], $regs[3], $regs[1]);
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            } else {
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                $t = mktime($regs[4], $regs[5], $regs[6], $regs[2], $regs[3], $regs[1]);
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            }
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        }
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        return $t;
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    }
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}