<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
<meta name="Generator" content="Microsoft Word 15 (filtered medium)">
<style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
font-size:10.0pt;
font-family:"Arial",sans-serif;
mso-fareast-language:EN-US;}
p.MsoPlainText, li.MsoPlainText, div.MsoPlainText
{mso-style-priority:99;
mso-style-link:"Plain Text Char";
margin:0cm;
font-size:11.0pt;
font-family:"Calibri",sans-serif;}
span.EmailStyle23
{mso-style-type:personal-compose;
font-family:"Arial",sans-serif;
color:windowtext;}
span.PlainTextChar
{mso-style-name:"Plain Text Char";
mso-style-priority:99;
mso-style-link:"Plain Text";
font-family:"Calibri",sans-serif;
mso-fareast-language:EN-GB;}
.MsoChpDefault
{mso-style-type:export-only;
font-family:"Arial",sans-serif;
mso-fareast-language:EN-US;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:72.0pt 72.0pt 72.0pt 72.0pt;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang="EN-GB" link="#8B00CC" vlink="#B19FBA" style="word-wrap:break-word">
<div class="WordSection1">
<p class="MsoPlainText">Hello,<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">I believe I have discovered a bug in java.time. I've searched Jira and couldn't find any existing similar issue.
<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Consider the following code:<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"> var t1 = Instant.parse("2023-05-03T10:00:00.000999Z");<o:p></o:p></p>
<p class="MsoPlainText"> var t2 = Instant.parse("2023-05-03T10:00:01.000Z");<o:p></o:p></p>
<p class="MsoPlainText"> var t3 = Instant.parse("2023-05-03T10:00:01.001Z");<o:p></o:p></p>
<p class="MsoPlainText"> <o:p></o:p></p>
<p class="MsoPlainText"> System.out.println(MILLIS.between(t1, t2));<o:p></o:p></p>
<p class="MsoPlainText"> System.out.println(MILLIS.between(t1, t3));<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">This prints:<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"> 1000<o:p></o:p></p>
<p class="MsoPlainText"> 1000<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">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.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">The JavaDoc for between() states "The calculation returns a whole number, representing the number of complete units between the two temporals."<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Assuming I have understood this correctly, I think MILLIS.between(t1, t3) is correct but MILLIS.between(t1, t2) should return 999.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Regards<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Stuart Sharpe<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div><br><div><div><div><div><div><div>This communication and any attachments are confidential and intended solely for the addressee. If you are not the intended recipient please advise us immediately and delete it. Unless specifically stated in the message or otherwise indicated, you may not duplicate, redistribute or forward this message and any attachments are not intended for distribution to, or use by any person or entity in any jurisdiction or country where such distribution or use would be contrary to local law or regulation. NatWest Markets Plc, NatWest Markets N.V., NatWest Markets Securities Japan Limited and/or NatWest Markets Securities Inc. (collectively "NatWest Markets") accepts no responsibility for any changes made to this message after it was sent.<div>This communication, where prepared by the sales and trading desk or desk strategists, may be marketing material, desk strategy and/or trader commentary. It is not a product of the research department. This material may constitute an invitation to consider entering into a derivatives transaction under U.S. CFTC Regulations sections 1.71 and 23.605, where applicable, but is not a binding offer to buy/sell any financial instrument. The views of the author may differ from others at NatWest Markets.<div>Unless otherwise specifically indicated, the contents of this communication and its attachments are for information purposes only and should not be regarded as an offer or solicitation to buy or sell a product or service, confirmation of any transaction, a valuation, indicative price or an official statement. Trading desks may have a position or interest that is inconsistent with any views expressed in this message. In evaluating the information contained in this message, you should know that it could have been previously provided to other clients and/or internal NatWest Markets personnel, who could have already acted on it.<div>NatWest Markets cannot provide absolute assurances that all electronic communications (sent or received) are secure, error free, not corrupted, incomplete or virus free and/or that they will not be lost, mis-delivered, destroyed, delayed or intercepted/decrypted by others. Therefore NatWest Markets disclaims all liability with regards to electronic communications (and the contents therein) if they are corrupted, lost destroyed, delayed, incomplete, mis-delivered, intercepted, decrypted or otherwise misappropriated by others.<div>Any electronic communication that is conducted within or through NatWest Markets systems will be subject to being archived, monitored and produced to regulators and in litigation in accordance with NatWest Markets’ policy and local laws, rules and regulations. Unless expressly prohibited by local law, electronic communications may be archived in countries other than the country in which you are located, and may be treated in accordance with the laws and regulations of the country of each individual included in the entire chain.<div>Copyright © NatWest Markets Plc. All rights reserved. See https://www.nwm.com/disclaimer for further risk disclosure (the agency arrangements referred to in the further risk disclosure between NatWest Markets Plc and NatWest Markets N.V. are not applicable to branches of NatWest Markets N.V.).</body>
</html>