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| <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></nav> <ul class="sidebar-links"><li><section class="sidebar-group depth-0"><p class="sidebar-heading"><span>IoTDB User Guide (In progress)</span> <!----></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>IoTDB Introduction</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Quick Start</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Data Concept</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>CLI</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Administration Management</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>IoTDB-SQL Language</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>API</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/UserGuide/Master/API/Programming-JDBC.html" class="sidebar-link">JDBC</a></li><li><a href="/UserGuide/Master/API/Programming-Java-Native-API.html" class="sidebar-link">Java Native API</a></li><li><a href="/UserGuide/Master/API/Programming-Python-Native-API.html" class="sidebar-link">Python Native API</a></li><li><a href="/UserGuide/Master/API/Programming-Cpp-Native-API.html" class="sidebar-link">C++ Native API</a></li><li><a href="/UserGuide/Master/API/Programming-Go-Native-API.html" class="sidebar-link">Go Native API</a></li><li><a href="/UserGuide/Master/API/Programming-TsFile-API.html" class="sidebar-link">TsFile API</a></li><li><a href="/UserGuide/Master/API/Time-zone.html" aria-current="page" class="active sidebar-link">Time zone</a></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Advanced Features</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Communication Service Protocol</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>System Tools</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Collaboration of Edge and Cloud</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Ecosystem Integration</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Cluster Setup</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>FAQ</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Appendix</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Comparison with TSDBs</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <main class="page"> <div class="content content__default"><h1 id="time-zone"><a href="#time-zone" class="header-anchor">#</a> Time zone</h1> <p>When a client connects to the IoTDB server, it can specify the time zone to be used for this connection. If not specified, the default time zone is the one of the client.</p> <p>The time zone can be set in both JDBC and session native interface connections. The usage is as follows:</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code>JDBC<span class="token operator">:</span> <span class="token punctuation">(</span><span class="token class-name">IoTDBConnection</span><span class="token punctuation">)</span> connection<span class="token punctuation">.</span><span class="token function">setTimeZone</span><span class="token punctuation">(</span><span class="token string">"+08:00"</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| |
| <span class="token class-name">Session</span><span class="token operator">:</span> session<span class="token punctuation">.</span><span class="token function">setTimeZone</span><span class="token punctuation">(</span><span class="token string">"+08:00"</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><p>In the CLI command line tool, the way to manually set the time zone through SQL is as follows:</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token class-name">SET</span> time_zone<span class="token operator">=</span><span class="token operator">+</span><span class="token number">08</span><span class="token operator">:</span><span class="token number">00</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>The way to view the time zone used by the current connection is as follows:</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code>JDBC<span class="token operator">:</span> <span class="token punctuation">(</span><span class="token class-name">IoTDBConnection</span><span class="token punctuation">)</span> connection<span class="token punctuation">.</span><span class="token function">getTimeZone</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| |
| <span class="token class-name">Session</span><span class="token operator">:</span> session<span class="token punctuation">.</span><span class="token function">getTimeZone</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><h2 id="time-zone-usage-scenarios"><a href="#time-zone-usage-scenarios" class="header-anchor">#</a> Time zone usage scenarios</h2> <p>The IoTDB server only stores and processes time stamps, and the time zone is only used to interact with clients. The specific scenarios are as follows:</p> <ol><li><p>Convert the time format string sent from the client to the corresponding time stamp.</p> <p>For example，execute <code>insert into root.sg.d1(timestamp, s1) values(2021-07-01T08:00:00.000, 3.14)</code></p> <p>Then <code>2021-07-01T08:00:00.000</code> will be converted to the corresponding timestamp value according to the time zone of the client. If it's in GMT+08:00, the result will be <code>1625097600000</code> ，which is equal to the timestamp value of <code>2021-07-01T00:00:00.000</code> in GMT+00:00。</p> <blockquote><p>Note: At the same time, the dates of different time zones are different, but the timestamps are the same.</p></blockquote></li> <li><p>Convert the timestamp in the result returned to the client into a time format string.</p> <p>Take the above situation as an example，execute <code>select * from root.sg.d1</code>，the server will return the time value pair: <code>(1625097600000, 3.14)</code>. If CLI tool is used，then <code>1625097600000</code> will be converted into time format string according to time zone, as shown in the figure below：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>+-----------------------------+-------------+ |
| | Time|root.sg.d1.s1| |
| +-----------------------------+-------------+ |
| |2021-07-01T08:00:00.000+08:00| 3.14| |
| +-----------------------------+-------------+ |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br></div></div><p>If the query is executed on the client in GMT:+00:00, the result will be as follows:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>+-----------------------------+-------------+ |
| | Time|root.sg.d1.s1| |
| +-----------------------------+-------------+ |
| |2021-07-01T00:00:00.000+00:00| 3.14| |
| +-----------------------------+-------------+ |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br></div></div><p>Note that the timestamps returned are the same, but the dates shown in different time zones are different.</p></li></ol></div> <div class="page-nav"><p class="inner"><span class="prev"> |
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