Date Picker In Visualforce Page

VF Page :

<apex:page controller="DatePickerInVFPageController">

   <apex:form >
      <apex:inputfield value="{!selectDate}"/>

   </apex:form>
</apex:page>

Controller Page:

public with sharing class DatePickerInVFPageController {
    public Date selectDate {get; set;}
    public DatePickerInVFPageController() {
    }
}

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Or

VF Page :

Custom Object With Custom Date Field
<apex:form >
   <apex:inputfield value="{!objEmployeeJoiningDateField.employeeJoinDate}"/>
</apex:form>
<apex:outputPanel id="panel">
   <apex:outputText value="{!objEmployeeJoiningDateField.employeeJoinDate}"/>
</apex:outputPanel>

Controller Page:

public with sharing class DatePickerInVFPageController {
    public Employee__c objEmployeeJoiningDateField {get; set;} 
    public DatePickerInVFPageController() {
        objEmployeeJoiningDateField = new Employee__c();
    }
}