TS2362 - Error when doing arithmetic operations on date

[erichillah]

Hi,
The following valid js code compile with TS2362 error

let start = new Date();
let elapsed = new Date() - start;

index.ts(9,22): error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.
index.ts(9,37): error TS2363: The right-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.

To avoid the error i need to explicitely cast opreands wit <any>.

[weswigham]

Duplicates #2361 since this works because valueOf a Date is a number.

[weswigham]

BTW, a canonical workaround (and generally safer thing to do) is this:

let start = +new Date();
let elapsed = +new Date() - start;

Unary + will coerce to number.

[erichillah]

Thanks, I've checked #2361 and didn't know all that about the Date object. Happy enough with the unary + operator.
Closing this issue.