Time difference calculation bug

[Roger Riggs]

Hi,

The seconds and nano-seconds are computed separately.
The representation of Instant holds seconds and nanoseconds separately.

The computation is performed on the nano-seconds of the Instant and 
truncated to milliseconds.
The value of 0.000999 becomes 0 when truncated to MILLIS.

Regards, Roger

On 5/3/23 12:54 PM, SHARPE, Stuart (Commercial & Institutional CDIO) wrote:
>
> Hello,
>
> I believe I have discovered a bug in java.time. I've searched Jira and 
> couldn't find any existing similar issue.
>
> Consider the following code:
>
>     var t1 = Instant.parse("2023-05-03T10:00:00.000999Z");
>
>     var t2 = Instant.parse("2023-05-03T10:00:01.000Z");
>
>     var t3 = Instant.parse("2023-05-03T10:00:01.001Z");
>
>     System.out.println(MILLIS.between(t1, t2));
>
> System.out.println(MILLIS.between(t1, t3));
>
> This prints:
>
>     1000
>
>     1000
>
> Given that t3 is exactly one millisecond later than t2, it does not 
> seem reasonable that they can both be 1000 milliseconds later than t1.
>
> The JavaDoc for between() states "The calculation returns a whole 
> number, representing the number of complete units between the two 
> temporals."
>
> Assuming I have understood this correctly, I think MILLIS.between(t1, 
> t3) is correct but MILLIS.between(t1, t2) should return 999.
>
> Regards
>
> Stuart Sharpe
>
>
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