<div id="readability-page-1" class="page"><div>
 
 <article>
 <ul id="markdown-toc">
 <li><a href="#examples" id="markdown-toc-examples">Examples</a> <ul>
 <li><a href="#macos" id="markdown-toc-macos">MacOS</a></li>
 <li><a href="#gnu" id="markdown-toc-gnu">GNU</a></li>
 </ul>
 </li>
 <li><a href="#format" id="markdown-toc-format">Format</a></li>
 <li><a href="#참고문헌" id="markdown-toc-참고문헌">참고문헌</a></li>
</ul>

<h2 id="examples">Examples</h2>
<h3 id="macos">MacOS</h3>

<div><pre><code> # 현재 날짜, 시간
date

 # UTC 현재 날짜, 시간
date -u

 # 현재 날짜, 시간 포매팅
date '+%Y-%m-%d %H:%M:%S %a %Z'

 # UTC 현재 날짜, 시간 포매팅
date -u '+%Y-%m-%d %H:%M:%S %a %Z'

 # 오늘은 1년 중 몇 번째 주(week)인가?
date +%V

 # 현재의 unix timestamp를 출력
date +%s

 # unix timestamp를 읽기 쉬운 날짜로 변환
date -r 1572511074

 # yyyy-MM-dd 형식의 날짜를 timestamp로 변환
date -jf %Y-%m-%d "2022-03-09" +%s

 # 두 날짜 사이의 일수를 구하기
from_time=$(date -jf %Y-%m-%d "2022-03-09" +%s)
to_time=$(date -jf %Y-%m-%d "2022-03-07" +%s)
echo $(((from_time - to_time) / 86400)) # 결과는 2
</code></pre></div>

<h3 id="gnu">GNU</h3>

mac에서 GNU <code>date</code>를 사용하려면 <code>coreutils</code>를 설치하면 된다.



<div><pre><code>$ # 날짜를 unixtimestamp로 변환
$ gdate --date="0001-01-01T00:00:00Z" +%s
-62135596800

$ gdate --date="1970-01-01T00:00:00Z" +%s
0

$ gdate --date="2022-01-01T00:00:00Z+0000" +%s
1640995200

$ gdate --date="2022-01-01T00:00:00Z+0900" +%s
1640962800

$ # unixtimestamp를 날짜로 변환
$ gdate -d @1640995200 +"%F %T %z"
2022-01-01 09:00:00 +0900

$ gdate -d @1640995200 +"%F %T %z" --utc
2022-01-01 00:00:00 +0000
</code></pre></div>

<h2 id="format">Format</h2>

<ul>
 <li>명령어 예제를 실행한 결과의 기준은 <code>2018년 8월 3일 금요일 05시 49분 37초</code>.</li>
</ul>

<table>
 <thead>
 <tr>
 <th>포맷 옵션</th>
 <th>설명</th>
 <th>명령어 예제</th>
 <th>실행 결과</th>
 </tr>
 </thead>
 <tbody>
 <tr>
 <td><code>%</code></td>
 <td>%</td>
 <td><code>date +%</code></td>
 <td><code>%</code></td>
 </tr>
 <tr>
 <td><code>%n</code></td>
 <td><code>\n</code></td>
 <td><code>date +%n</code></td>
 <td>공백 라인이 출력된다.</td>
 </tr>
 <tr>
 <td><code>%t</code></td>
 <td><code>\t</code></td>
 <td><code>date +%n</code></td>
 <td>탭 문자가 출력된다.</td>
 </tr>
 <tr>
 <td><code>%s</code></td>
 <td>epoch 타임</td>
 <td><code>date +%s</code></td>
 <td><code>1533242977</code></td>
 </tr>
 <tr>
 <td><code>%Y</code></td>
 <td>4자리 년도</td>
 <td><code>date +%Y</code></td>
 <td><code>2018</code></td>
 </tr>
 <tr>
 <td><code>%y</code></td>
 <td>2자리 년도</td>
 <td><code>date +%y</code></td>
 <td><code>18</code></td>
 </tr>
 <tr>
 <td><code>%A</code></td>
 <td>요일 이름(locale)</td>
 <td><code>date +%A</code></td>
 <td><code>금요일</code></td>
 </tr>
 <tr>
 <td><code>%a</code></td>
 <td>요일 이름(locale)</td>
 <td><code>date +%a</code></td>
 <td><code>금</code></td>
 </tr>
 <tr>
 <td><code>%B</code></td>
 <td>월 이름(locale)</td>
 <td><code>date +%B</code></td>
 <td><code>8월</code></td>
 </tr>
 <tr>
 <td><code>%b</code></td>
 <td>월 이름(locale)</td>
 <td><code>date +%b</code></td>
 <td><code>8</code></td>
 </tr>
 <tr>
 <td><code>%m</code></td>
 <td>월(01 ~ 12)</td>
 <td><code>date +%m</code></td>
 <td><code>08</code></td>
 </tr>
 <tr>
 <td><code>%c</code></td>
 <td>날짜 및 시간(locale)</td>
 <td><code>date +%c</code></td>
 <td><code>금 8/ 3 05:49:37 2018</code></td>
 </tr>
 <tr>
 <td><code>%d</code></td>
 <td>Month 날짜(01 ~ 31)</td>
 <td><code>date +%d</code></td>
 <td><code>03</code></td>
 </tr>
 <tr>
 <td><code>%j</code></td>
 <td>Year 날짜(001 ~ 366)</td>
 <td><code>date +%j</code></td>
 <td><code>215</code></td>
 </tr>
 <tr>
 <td><code>%w</code></td>
 <td>요일 숫자(0: 일요일)</td>
 <td><code>date +%w</code></td>
 <td><code>5</code></td>
 </tr>
 <tr>
 <td><code>%H</code></td>
 <td>시간(00 ~ 23)</td>
 <td><code>date +%H</code></td>
 <td><code>05</code></td>
 </tr>
 <tr>
 <td><code>%M</code></td>
 <td>분(00 ~ 59)</td>
 <td><code>date +%M</code></td>
 <td><code>49</code></td>
 </tr>
 <tr>
 <td><code>%S</code></td>
 <td>초(00 ~ 59)</td>
 <td><code>date +%S</code></td>
 <td><code>37</code></td>
 </tr>
 <tr>
 <td><code>%V</code></td>
 <td>week 숫자</td>
 <td><code>date +%V</code></td>
 <td><code>31</code></td>
 </tr>
 <tr>
 <td><code>%Z</code></td>
 <td>타임존</td>
 <td><code>date +%Z</code></td>
 <td><code>KST</code></td>
 </tr>
 </tbody>
</table>

<h2 id="참고문헌">참고문헌</h2>

<ul>
 <li><a href="https://www.gnu.org/software/coreutils/manual/html_node/Examples-of-date.html">21.1.7 Examples of date (gnu.org)</a></li>
</ul>


 </article>


 
 
 



</div></div>

기계인간 John Grib

JohnGrib

날짜나 시간을 출력하거나 설정한다

date 명령어

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