Extjs: how to send empty timefield?

Question

I'm developing Extjs form and have to send all field, also empty fields. It works for all types of fields only timefield is not send. Here an example with datefield and timefield. Why do they behavior differently? Which config should I use to send empty timefield? Preferred as variable name with empty string as value. Do you have an idea?

Ext.create('Ext.form.Panel', {
renderTo: Ext.getBody(),
standardSubmit: true,
items: [{
    fieldLabel: 'Datefield',
    format: 'Y-m-d',
    name: 'Datefield',
    // value: '2015-01-01',
    xtype: 'datefield'
},{
    fieldLabel: 'Timefield',
    format: 'H:i:s',
    name: 'Timefield',
    // value: '16:00:00',
    xtype: 'timefield'
}],
buttons: [{
    text: 'Submit',
    formBind: true,
    handler: function(){
        this.up('form').getForm().submit({
            url: 'http://yourfavoriteurl',
            standardSubmit: true,
            method: 'POST' // 'GET'
        });
    }
}] 
});

Answer 1

The timefield was developed that way on purpose because it is a normal thing to omit time from queries.

If you want this field to behave like the datefield when empty, add this override:

Ext.define('Ext.view.override.TimeField',{
     override: 'Ext.form.field.Time',

     getSubmitValue: function() {
        var me = this,
            format = me.submitFormat || me.format,
            value = me.getValue();

        return value ? Ext.Date.format(value, format) : "";
    }
});