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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-29627] Replace pieces of time_support.h/cpp if they can be implemented using new timezone library</title>
                <link>https://jira.mongodb.org/browse/SERVER-29627</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;As part of the review for &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-28611&quot; title=&quot;Add the tzExpression argument to the date extraction functions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-28611&quot;&gt;&lt;del&gt;SERVER-28611&lt;/del&gt;&lt;/a&gt; we realized we now have some duplicate logic in time_support.h and date_time_support.h. We should re-jigger the libraries and make time_support.h use the new helpers that call into timelib.&lt;/p&gt;

&lt;p&gt;The following new format specifiers will also be available after this gets merged:&lt;/p&gt;

&lt;p&gt;%a&lt;br/&gt;
  The abbreviated English name of the day of the week.&lt;/p&gt;

&lt;p&gt;%b&lt;br/&gt;
  The abbreviated English name of the month.&lt;/p&gt;

&lt;p&gt;%e&lt;br/&gt;
  The day of the month as a decimal number, but unlike ``%d``, pre-padded with space instead of a ``0``.&lt;/p&gt;</description>
                <environment></environment>
        <key id="393912">SERVER-29627</key>
            <summary>Replace pieces of time_support.h/cpp if they can be implemented using new timezone library</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="charlie.swanson@mongodb.com">Charlie Swanson</reporter>
                        <labels>
                    </labels>
                <created>Wed, 14 Jun 2017 18:01:52 +0000</created>
                <updated>Tue, 6 Dec 2022 03:58:48 +0000</updated>
                                                                            <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1632267" author="schwerin" created="Wed, 26 Jul 2017 15:14:33 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=derick&quot; class=&quot;user-hover&quot; rel=&quot;derick&quot;&gt;derick&lt;/a&gt;, a bunch of the code for serializing Date_t to strings is used by the diagnostic logging code, and so must be present in the &quot;base&quot; library. This change may require more work than is warranted right now. It&apos;s not clear to me why the date/time support library in query is in query at all, and teasing it out of there may be required in order to fix to use it in time_support.h/cpp.&lt;/p&gt;

&lt;p&gt;From my survey of the code, I think the work items for this ticket would be as follows:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;remove references to ServiceContext from date_time_support.h/cpp&lt;/li&gt;
	&lt;li&gt;move those files into the base directory,&lt;/li&gt;
	&lt;li&gt;Add $BUILD_DIR/third_party/shim_timelib to the baseLibDeps and base/date_time_support.cpp to baseSource&lt;/li&gt;
	&lt;li&gt;Replace the pieces of time_support.h/cpp with those provided by the new timezone code.&lt;/li&gt;
	&lt;li&gt;Put a separate library together that attaches a TimeZoneDatabase to ServiceContext (the piece removed in step 1). That library is separate from base, and its only job is to decorate ServiceContext with a TimeZoneDatabase.&lt;/li&gt;
&lt;/ol&gt;
</comment>
                            <comment id="1631133" author="charlie.swanson" created="Tue, 25 Jul 2017 14:29:51 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=derick&quot; class=&quot;user-hover&quot; rel=&quot;derick&quot;&gt;derick&lt;/a&gt; I think it&apos;d be good to move as much of the date handling as we can into date_time_support. I feel like &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.5.10/src/mongo/util/time_support.h#L235-L288&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;these things&lt;/a&gt; can at least be moved into date_time_support.h, if not re-implemented by using timelib. Also, I think we were planning to make Value::coerceToString() output a date type using the ISO standard, which it currently doesn&apos;t do because it leaves off the milliseconds and the &apos;Z&apos;, which I was vaguely hoping was part of this work. I&apos;m happy to spin off a separate ticket for that though, since it seems mostly orthogonal&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10010">
                    <name>Duplicate</name>
                                                                <inwardlinks description="is duplicated by">
                                        <issuelink>
            <issuekey id="370755">SERVER-28609</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="542554">SERVER-34949</issuekey>
        </issuelink>
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