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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