Source of validate.inc.php - Zabbix

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        }
    }
    else {
        $error = _('a time unit is expected');
​
        return false;
    }
​
    return true;
}
​
/**
 * Validate "from" and "to" parameters for allowed time period.
 *
 * @param string from
 * @param string to
 */
function validateTimeSelector($from, $to) {
    $period_from = null;
    $period_to = null;
    $ts = [];
    $ts['now'] = time();
    $range_time_parser = new CRangeTimeParser();
​
    if (($from !== '') && $range_time_parser->parse($from) == CParser::PARSE_SUCCESS) {
        $period_from = $range_time_parser
            ->getDateTime(true)
            ->getTimestamp();
    }
    else {
        error(_s('Incorrect value for field "%1$s": %2$s.', _s('From'), _('a date is expected')));
    }
​
​
    if (($to !== '') && $range_time_parser->parse($to) == CParser::PARSE_SUCCESS) {
        $period_to = $range_time_parser
            ->getDateTime(true)
            ->getTimestamp();
    }
    else {
        error(_s('Incorrect value for field "%1$s": %2$s.', _s('To'), _('a date is expected')));
    }
​
    if ($from !== '' && $to !== '' && $range_time_parser->parse($to) == CParser::PARSE_SUCCESS
            && $range_time_parser->parse($from) == CParser::PARSE_SUCCESS) {
        foreach (['from' => $from, 'to' => $to] as $field => $value) {
            $range_time_parser->parse($value);
​
            $ts[$field] = $range_time_parser->getDateTime($field === 'from')->getTimestamp();
        }
    }
​
    if ($from !== '' && $to !== '' && $range_time_parser->parse($to) == CParser::PARSE_SUCCESS
            && $range_time_parser->parse($from) == CParser::PARSE_SUCCESS) {
        $period = $ts['to'] - $ts['from'] + 1;
        $range_time_parser->parse('now-'.CSettingsHelper::get(CSettingsHelper::MAX_PERIOD));
        $max_period = 1 + $ts['now'] - $range_time_parser->getDateTime(true)->getTimestamp();
​
        if ($period_from !== null && $period_to !== null && $period_to < $period_from) {
            error(_s('"%1$s" date must be less than "%2$s" date.', _('From'), _('To')));
        }
        elseif ($period < ZBX_MIN_PERIOD) {
            error(_n('Minimum time period to display is %1$s minute.',
                'Minimum time period to display is %1$s minutes.', (int)(ZBX_MIN_PERIOD / SEC_PER_MIN)
            ));
        }
        elseif ($period > $max_period) {
            error(_n('Maximum time period to display is %1$s day.',
                'Maximum time period to display is %1$s days.', (int)round($max_period / SEC_PER_DAY)
            ));
        }
    }
}