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<div class=" wh_topic_content body "><main role="main"><article class="- topic/topic concept/concept topic concept" role="article" aria-labelledby="ariaid-title1"><span class="edit-link" style="font-size:12px; opacity:0.6; text-align:right; vertical-align:middle"><a target="_blank" href="http://172.16.35.88/tasks/jdssno1uvvbf2mltu9kb9v3if05d5gopuakboe8hlud18rma/edit/F:/aicdita/aicdita-cn/topics/sdk/advanced/hwclock_cmd_ref_guide.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">hwclock 命令参考指南</h1><div class="date inPage">19 Dec 2024</div><div style="color: gray;"></div><div class="- topic/body concept/conbody body conbody"><div class="- topic/p p" data-ofbid="d222789e25__20250121171647">Busybox 源码自带一个 <code class="+ topic/ph pr-d/codeph ph codeph">hwclock</code> 工具，用来读取和设置 RTC 时间。用法如下：<ul class="- topic/ul ul" id="hwclock_cmd_ref_guide__ul_jkd_dmz_sdc" data-ofbid="hwclock_cmd_ref_guide__ul_jkd_dmz_sdc"><li class="- topic/li li" data-ofbid="d222789e31__20250121171647">
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<div class="- topic/p p" data-ofbid="d222789e33__20250121171647">读取当前 RTC
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时间（不加任何参数时就默认是读取）：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="hwclock_cmd_ref_guide__codeblock_fm2_2mz_sdc" data-ofbid="hwclock_cmd_ref_guide__codeblock_fm2_2mz_sdc">hwclock -r</pre></div>
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<div class="- topic/p p" data-ofbid="d222789e38__20250121171647">输出示例如下：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="hwclock_cmd_ref_guide__pre_sxs_bts_c1c" data-ofbid="hwclock_cmd_ref_guide__pre_sxs_bts_c1c">Thu Jan <span class="hl-number">100</span>:<span class="hl-number">00</span>:<span class="hl-number">00</span> <span class="hl-number">19700.000000</span> seconds</pre></div>
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</li><li class="- topic/li li" data-ofbid="d222789e43__20250121171647">
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<div class="- topic/p p" data-ofbid="d222789e45__20250121171647">读取当前 RTC
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时间，并加上时区校准：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="hwclock_cmd_ref_guide__codeblock_cg1_gmz_sdc" data-ofbid="hwclock_cmd_ref_guide__codeblock_cg1_gmz_sdc">hwclock -ru</pre></div>
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</li><li class="- topic/li li" data-ofbid="d222789e50__20250121171647">
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<div class="- topic/p p" data-ofbid="d222789e52__20250121171647">将当前的系统时间同步设置到
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RTC：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="hwclock_cmd_ref_guide__codeblock_rbw_gmz_sdc" data-ofbid="hwclock_cmd_ref_guide__codeblock_rbw_gmz_sdc">hwclock -w</pre></div>
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</li><li class="- topic/li li" data-ofbid="d222789e57__20250121171647">
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<div class="- topic/p p" data-ofbid="d222789e59__20250121171647">将当前的系统时间减去时区值，并同步设置到
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RTC：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="hwclock_cmd_ref_guide__codeblock_xkz_3mz_sdc" data-ofbid="hwclock_cmd_ref_guide__codeblock_xkz_3mz_sdc">hwclock -wu</pre></div>
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</li><li class="- topic/li li" data-ofbid="d222789e64__20250121171647">
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<div class="- topic/p p" data-ofbid="d222789e66__20250121171647">将 RTC
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时间同步到系统时间：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="hwclock_cmd_ref_guide__codeblock_q3h_fmz_sdc" data-ofbid="hwclock_cmd_ref_guide__codeblock_q3h_fmz_sdc">hwclock -s </pre></div>
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