React Input One Step Behind

HTML

<div class="app"></div>

JavaScript

var App = React.createClass({
    getInitialState: function() {
        return {
            hours: {
            	labelText: 'Hours used per day',
              value: 0
            },
            days: {
              labelText: 'Days used per year',
              value: 0
            },        
        }
		},
    calculate: function() {
    	this.state.hours.value + ( 24 * this.state.days.value )
    },
    handleInputChange: function(e) {
    	
    },
    render: function() {
    	return (
      		<IntegerInput
            value={this.state.hours.value}
            labelText={this.state.hours.labelText}
            onChange={this.handleInputChange}  />

          <IntegerInput
            value={this.state.days.value}
            labelText={this.state.days.labelText}
            onChange={this.handleInputChange} />            
      )
    }
})