Making a Birthday Contract.

Intermediate Solidity Ethereum Notes & Development.

Let’s make a Birthday smart contract in Solidity.

Note/selfplug: If you are looking for an introduction to Ethereum, Solidity and Smart Contracts I just published an eBook on getting started:
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The Problem / challenge:

• To have a contract record it’s birth on the blockchain.
• To have the contract tell you it’s Birthday.
• Bonus / Extra Credit: Return the Birthday in a Human Readable way without the need of external UI’s.

The contract :

pragma solidity ^ 0.4.0;
contract DateTime {
        function getYear(uint timestamp) public constant returns (uint16);
        function getMonth(uint timestamp) public constant returns (uint8);
        function getDay(uint timestamp) public constant returns (uint8);
}
contract BirthDay {
  uint public bday;
  address public dateTimeAddr = 0x8Fc065565E3e44aef229F1D06aac009D6A524e82;
  DateTime dateTime =…