Simple Date picker use in Visualforce page

************ Controller *****************


public class Sample {
    public Date dat {get;set;}
    public Sample() {

    }
}



****************Visualforce Page *******************

<apex:page docType="html-5.0" controller="Sample" showHeader="false">
<apex:form >
    <apex:pageBlock >
        <apex:pageBlockSection >
            <apex:pageBlockSectionItem >
                Date: <apex:input type="date" value="{!dat}"/>
            </apex:pageBlockSectionItem>
        </apex:pageBlockSection>
    </apex:pageBlock>
</apex:form>
</apex:page>