Comment by kaoD
4 months ago
The only reason I can think of to 0-index months is so you can do monthName[date.getMonth()] instead of monthName[date.getMonth() - 1].
I don't think adding counterintuitive behavior to your data to save a "- 1" here and there is a good idea, but I guess this is just legacy from the ancient times.
A [StackOverflow thread](https://stackoverflow.com/a/41992352) about this interface says it was introduced by Java way back in 1995, and copied by the first JavaScript implementation.
(We don't have Markdown formatting here, BTW. But thanks for the heads up, and welcome to YC.)
That would have a better solution in a date.getCurrentMonth(), in my opinion.
Temporal[0] is coming which solves many many many issues with JS Date, 1-based months[1] included!
Can't wait for it to be stable and widely available, it's just too good.
> month values start at 1, which is different from legacy Date where months are represented by zero-based indices (0 to 11)
[0] https://tc39.es/proposal-temporal/docs/
[1] https://tc39.es/proposal-temporal/docs/plaindate.html#month