Function `eachDayOfInterval` throws "RangeError: Invalid Interval" for interval that should be valid

I’m giving the eachDayOfInterval function an input of two JavaScript Date objects that should be valid. They are the outputs of other date-fns functions startOfWeek and endOfWeek. I get the expected output from the eachDayOfInterval function, but because it throws an error, my code execution stops.

Also, I might be wrong in my report (I’m a new programmer, so I’m not super confident in this).

Here’s an example code:

const someDate = new Date()
const startDateThisWeek = startOfWeek(someDate)
const endDateThisWeek = endOfWeek(someDate)
const arrayOfDaysThisWeek = eachDayOfInterval({ start: startDateThisWeek, end: endDateThisWeek })
// RangeError: Invalid interval

console.log(arrayOfDaysThisWeek)

/*
[
      2020-01-26T08:00:00.000Z,
      2020-01-27T08:00:00.000Z,
      2020-01-28T08:00:00.000Z,
      2020-01-29T08:00:00.000Z,
      2020-01-30T08:00:00.000Z,
      2020-01-31T08:00:00.000Z,
      2020-02-01T08:00:00.000Z
    ]
*/

Here’s a screenshot of my tests:

p.s. Happy to look into the code myself and PR a fix. Let me know!

[tonyQuig]

For anyone still looking into this, creating a new Date instance inside the startOfMonth and endOfMonth functions seems to work with eachDayOfInterval().

const start = startOfMonth(new Date(someDate)) const end = endOfMonth(new Date(someDate)) eachDayOfInterval({ start: start, end: end })

Hope this helps!

[Tzinov15]

I also just ran into this and fwiw it was only happening in Safari for me