{% macro interval_input(obj, attrname, scales) -%}

<input type=number name={{attrname}}_significand
value={{obj[attrname + '_significand']}}
style='max-width:8ch' min=0 step=1>
<select name={{attrname}}_scale>
{%- for scale in scales %}
    <option value="{{scale[1].total_seconds()}}"
    {{- ' selected' if scale[1] == obj[attrname + '_scale'] -}}
    >{{scale[0]}}</option>
{% endfor -%}
</select>


{%- endmacro %}