Checking whether a Date is valid in Typescript?

Question

However with Typescript is we do !isNaN(someDate), typescript complains that we are using a method that accepts numbers, and not dates.

Thoughts on how to go about handling this?

Since you are specifically doing typechecking, what about `isNaN(somedate as any)`? — random_user_name, Sep 24 '19 at 14:14
Just use `!isNaN(someDate.valueOf())`... or `getTime()` as [the accepted answer on the question you linked to shows](https://stackoverflow.com/a/1353711/215552)... — Heretic Monkey, Sep 24 '19 at 14:17
Possible duplicate of [Detecting an "invalid date" Date instance in JavaScript](https://stackoverflow.com/questions/1353684/detecting-an-invalid-date-date-instance-in-javascript) — Heretic Monkey, Sep 24 '19 at 14:20

score 22 · Accepted Answer · answered Sep 24 '19 at 14:17

22

a Date object is not an number, but you can use Date.getTime()

getTime() return a number value or NaN if the Date is not valid

answered Sep 24 '19 at 14:17

flagboy firelight

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