fromUnixTime vs parse vs toDate

[JeffBeltran]

This might be something really dumb that im missing but i would think these 3 methods would do the same thing

but it looks like fromUnixTime doesn't.

From the docs

• fromUnixTime: Create a date from a Unix timestamp.
• toDate: If the argument is a number, it is treated as a timestamp.
• parse: Milliseconds timestamp T

what am i missing?

[fturmel]

Hi @JeffBeltran,

Going through older discussions and I saw that no one answered you. It's probably a bit late, but maybe it'll help someone else. The difference here is simply that fromUnixTime expects a Unix timestamp in seconds (not milliseconds).

You can see it in the example section of the docs, but it's not very obvious. This could be improved, I'll work on a PR. https://date-fns.org/docs/fromUnixTime

So going back to your example, these would be roughly equivalent except the fromUnixTime date will have its milliseconds component lost in the conversion:

const ms = 1613611083646;

fromUnixTime(ms / 1000);
toDate(ms);
parse(ms, "T", new Date());

[JeffBeltran]

something really dumb that im missing

yup, not sure why i didn't think to try that, but yeah time stuff is always weird. Thanks for the reply though