I am new to apex development and I want to be sure how date fields are represnted and evaluated internally.  What is internal representation of  jan 1, 2019 ?    In this workflow the Deposit Due Date is April 14, 2019. Whats is it value? And if Today is May 29th, what is it's internal value?

I have completed the this trailhead and I get an erroneus error. See below.

When I click the link that is supposed to walk me through a 10 step demo of manual record sharing I get an error saying I need to contact admin for the proper permisions.  I have enclosed a screen shot for the 3 steps.   Any idea what I may have set up wrong?

I get this error on the "Add a form to the Visual Force Page.

Step Not yet complete... here's what's wrong:
The 'ContactForm' Visualforce page does not have a apex:inputField component
Note: you may run into errors if you've skipped previous steps.

However the Apex:inputField comonent is there.  Here is my code snipet.

<apex:form>
    Hello <apex:inputField value="
{!Contact.FirstName}" />
    <br /><apex:commandButton value="Submit" action="
{!save}"/>
</apex:form>

I am new to apex development and I want to be sure how date fields are represnted and evaluated internally.  What is internal representation of  jan 1, 2019 ?    In this workflow the Deposit Due Date is April 14, 2019. Whats is it value? And if Today is May 29th, what is it's internal value?

I get this error on the "Add a form to the Visual Force Page.

Step Not yet complete... here's what's wrong:
The 'ContactForm' Visualforce page does not have a apex:inputField component
Note: you may run into errors if you've skipped previous steps.

However the Apex:inputField comonent is there.  Here is my code snipet.

<apex:form>
    Hello <apex:inputField value="
{!Contact.FirstName}" />
    <br /><apex:commandButton value="Submit" action="
{!save}"/>
</apex:form>