liferay-ui input date clear value

How can I achieve a clear starting value for liferay-ui:input-date ?

When I try to use this:

<liferay-ui:input-date
monthParam="month"
monthValue="0"
monthNullable="<%= true %>"
dayParam="day"
dayValue="0"
dayNullable="<%= true %>"
yearParam="year"
yearValue="0"
yearNullable="<%= true %>"
/>

I get the following exception:

Attribute monthNullable invalid for tag input-date according to TLD

which I understand. When I remove the Nullable parameter and just set values to 0 the initial value is 12/31/1902... What I need to achieve, is to have no initial value of this field, unless it is chosen. Thank you for any kind of help.