Debug View rounding bug (Xcode) for Date returned by endOf function

[pgawlowski]

I am using:

let yearArray = [1970, 1991, 1999, 2005, nil].map( { transformEndDateOfYear($0) })

func transformEndDateOfYear(_ year: Int?) -> Date? {
	guard let year = year else {
		return nil
	}
	let d = Date(year: year, month: 12, day: 31, hour: 0, minute: 0)
	return d.dateAtEndOf(.day)
}

results are totally wrong

Same incorrect results for endOf month and year

[malcommac]

Have you tried to print the date? I've tried it and I found a curious behaviour

The date seems rounded in debug viewer but the value is actually correct. Generation code subtract the smallest unit possible from the date; that's the code: https://github.com/malcommac/SwiftDate/blob/master/Sources/SwiftDate/DateInRegion/DateInRegion%2BCreate.swift#L202:

let endOfThisUnit = Date(timeInterval: /*-0.001*/ -1, since: startOfNextUnit as Date)

If I try to increase the number of timeInterval to subtract to 1 even the debug viewer works fine.

let endOfThisUnit = Date(timeInterval: -1, since: startOfNextUnit as Date)

Can you confirm it?

[pgawlowski]

I would like to say it is correct however during tests I was doing comparison between transformEndDateOfYear and manually created dates (with using Date.init()) and it was constantly failing. It's been a while since I was working with this and I made a workaround here. I will try to reproduce as soon as possible.

[malcommac]

Ok I'll wait for you. We can decide to remove an entire second but if we found better alternatives I'll be more satisfied. Thanks for your support