function datetime($field, $value, $fieldinfo) {
        $require = $fieldinfo['min_length']  ? 'required' : '';
        $pattern = $fieldinfo['pattern'] ?$fieldinfo['pattern']:'';
        $errortips = $fieldinfo['error_tips'] ?$fieldinfo['error_tips']:'';
        extract(string2array($fieldinfo['setting']));
        if(!isset($save_format))$save_format = 'int';
        if(!isset($show_format))$show_format = 'Y-m-d H:i:s';
        if($save_format=='int') {
            if(!$value) $value = TIMESTAMP;
            $format_txt = $show_format == 'm-d' ? 'm-d' : $show_format;
            if($show_format == 'Y-m-d Ah:i:s') $format_txt = 'Y-m-d h:i:s';
            $value = get_date($value,$format_txt);
            if($show_format == 'Y-m-d H:i:s') {
                $dateFmt =   'yyyy-MM-dd HH:mm:ss';
                $bootstrapType = '';
            }
            else if($show_format == 'Y-m-d H:i') {
                $dateFmt =   'yyyy-MM-dd HH:mm';
            }
            else if($show_format == 'Y-m-d') {
                $dateFmt =   'yyyy-MM-dd';
            }
            else if($show_format == 'm-d') {
                $dateFmt =   'MM-dd';
            }
            else
            {
                $dateFmt =   'yyyy-MM-dd HH:mm:ss';
            }
        } else if($save_format=='datetime') {
            $dateFmt =   'yyyy-MM-dd HH:mm:ss';
        } else if($save_format=='date') {
            $dateFmt =   'yyyy-MM-dd';
        }
        else
        {
            $dateFmt =   'yyyy-MM-dd';
        }
        if(!isset($min_date))$min_date='';
        if(!isset($max_date))$max_date='';
        if(!isset($dynamic))$dynamic='';
        if(!isset($read_only))$read_only='';
        if(!isset($vel))$vel='';
        if(!isset($velName))$velName='';
        $defaultId = 'info_'.$field;
        $string =  '<div class="mb-3 row '.$require.'">';
        $string .= '<label class="col-md-2 col-form-label">'.$fieldinfo['name'].'</label>';
        $string .= '<div class="col-md-10">';
        $string .= FormElements::dateForm("info[$field]",$value,array('dateFmt'=>$dateFmt,'value'=>$value,'save_format'=>$save_format,'minDate'=>$min_date,'maxDate'=>$max_date,'dynamic'=>$dynamic,'readOnly'=>$read_only,'id'=>$vel,'name'=>$velName,'defaultId'=>$defaultId,'require'=>$require,'pattern'=>$pattern,'errortips'=>$errortips));
        $string .= $fieldinfo['tips']?'<div class="text-muted  input-word-aux">提示：'.$fieldinfo['tips'].'</div>':'';
        $string .= '</div>';
        $string .= '</div>';
        return $string;
    }