Hi,
I followed along on the YouTube video to learn how to create Dapps but got an error while running "truffle test" for the Date contract. Out put below

PS C:\DPUMD\FirstTruffle> truffle test
Using network 'test'.

Compiling your contracts...

Compiling .\contracts\Date.sol
Compiling .\contracts\Date.sol
Compiling .\contracts\Migrations.sol

ParserError: Expected ',' but got identifier
--> project:/contracts/Date.sol:44:34:
|
44 | require(msg.value == (10 finney), "claiming a date costs 10 finney");
| ^^^^^^

Compilation failed. See above.
Truffle v5.4.3 (core: 5.4.3)
Node v14.17.3

Is there a declaration for "10 finney" missing?
Your correspondence is appreciated

Line 151 has a type error??
TypeError: Operator + not compatible with types int256 and uint256
--> project:/contracts/Date.sol:151:23:
|
151 | year = uint16(int(yoe) + era * 400 + (month <= 2 ? 1 : 0));
| ^^^^^^^^^^^^^^^^^^^^

After about a week turning this over, referencing the fundamentals and documentation, I still don't have a solution for this. The lack of comments in the code notwithstanding, I'd like to know how you made it work. Are the differences between Mac and Windows that substantial?

it looks like the ui is calling a method totalSupply that is not defined in the Date.sol. What would that function look like?

I've downloaded the latest version of contract. Error reported when compile:
`

Compiling ./contracts/Date.sol
Compiling ./contracts/Migrations.sol

project:/contracts/Date.sol:40:47: ParserError: Expected '{' but got reserved keyword 'override'
function _baseURI() internal view virtual override returns (string memory) {
^------^

Compilation failed. See above.
Truffle v5.4.24 (core: 5.4.24)
Node v16.13.1
`
how to solve this problem?