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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head> <meta name="generator" content= "HTML Tidy for Linux/x86 (vers 1 September 2005), see www.w3.org"> <title>Standard C Date & Time</title> <link href="../cppreference.css" rel="stylesheet" type="text/css"></head><body><table> <tr> <td> <div class="body-content"> <div class="header-box"> <a href="../index.html">cppreference.com</a> > <a href= "index.html">Standard C Date & Time</a> </div> <div class="name-format"> asctime </div> <div class="syntax-name-format"> Syntax: </div> <pre class="syntax-box"> #include <time.h> char *asctime( const struct tm *ptr );</pre> <p>The function asctime() converts the time in the struct 'ptr' to a character string of the following format:</p> <pre class="example-code"> day month date hours:minutes:seconds year </pre> <p>An example:</p> <pre class="example-code"> Mon Jun 26 12:03:53 2000 </pre> <div class="related-name-format"> Related topics: </div> <div class="related-content"> <a href="clock.html">clock</a><br> <a href="ctime.html">ctime</a><br> <a href="difftime.html">difftime</a><br> <a href="gmtime.html">gmtime</a><br> <a href="localtime.html">localtime</a><br> <a href="mktime.html">mktime</a><br> <a href="time.html">time</a> </div> </div> </td> </tr> </table></body></html><hr> <div class="name-format"> clock </div> <div class="syntax-name-format"> Syntax: </div> <pre class="syntax-box"> #include <time.h> clock_t clock( void );</pre> <p>The clock() function returns the processor time since the program started, or -1 if that information is unavailable. To convert the return value to seconds, divide it by CLOCKS_PER_SEC. (Note: if your compiler is POSIX compliant, then CLOCKS_PER_SEC is always defined as 1000000.)</p> <div class="related-name-format"> Related topics: </div> <div class="related-content"> <a href="asctime.html">asctime</a><br> <a href="ctime.html">ctime</a><br> <a href="time.html">time</a> </div> </div> </td> </tr> </table></body></html><hr> <div class="name-format"> ctime </div> <div class="syntax-name-format"> Syntax: </div> <pre class="syntax-box"> #include <time.h> char *ctime( const time_t *time );</pre> <p>The ctime() function converts the calendar time time to local time of the format:</p> <pre class="example-code"> day month date hours:minutes:seconds year </pre> <p>using ctime() is equivalent to</p> <pre class="example-code"> asctime( localtime( tp ) ); </pre> <div class="related-name-format"> Related topics: </div> <div class="related-content"> <a href="asctime.html">asctime</a><br> <a href="clock.html">clock</a><br> <a href="gmtime.html">gmtime</a><br> <a href="localtime.html">localtime</a><br> <a href="mktime.html">mktime</a><br> <a href="time.html">time</a> </div> </div> </td> </tr> </table></body></html><hr> <div class="name-format"> difftime </div> <div class="syntax-name-format"> Syntax: </div> <pre class="syntax-box"> #include <time.h> double difftime( time_t time2, time_t time1 );</pre> <p>The function difftime() returns <em>time2</em> - <em>time1</em>, in seconds.</p> <div class="related-name-format"> Related topics: </div> <div class="related-content"> <a href="asctime.html">asctime</a><br> <a href="gmtime.html">gmtime</a><br> <a href="localtime.html">localtime</a><br> <a href="time.html">time</a> </div> </div> </td> </tr> </table></body></html><hr> <div class="name-format"> gmtime </div> <div class="syntax-name-format"> Syntax: </div> <pre class="syntax-box"> #include <time.h> struct tm *gmtime( const time_t *time );</pre> <p>The gmtime() function returns the given <em>time</em> in Coordinated Universal Time (usually Greenwich mean time), unless it's not supported by the system, in which case <strong>NULL</strong> is returned. Watch out for <a href= "../static_return.html">static return</a>.</p> <div class="related-name-format"> Related topics: </div> <div class="related-content"> <a href="asctime.html">asctime</a><br> <a href="ctime.html">ctime</a><br> <a href="difftime.html">difftime</a><br> <a href="localtime.html">localtime</a><br> <a href="mktime.html">mktime</a><br> <a href="strftime.html">strftime</a><br> <a href="time.html">time</a> </div> </div> </td> </tr> </table></body></html><hr> <div class="name-format"> localtime </div> <div class="syntax-name-format"> Syntax: </div> <pre class="syntax-box"> #include <time.h> struct tm *localtime( const time_t *time );</pre> <p>The function localtime() converts calendar time time into local time. Watch out for the <a href="../static_return.html">static return</a>.</p> <div class="related-name-format"> Related topics: </div> <div class="related-content"> <a href="asctime.html">asctime</a><br> <a href="ctime.html">ctime</a><br> <a href="difftime.html">difftime</a><br> <a href="gmtime.html">gmtime</a><br> <a href="strftime.html">strftime</a><br> <a href="time.html">time</a> </div> </div> </td> </tr> </table></body></html><hr> <div class="name-format"> mktime </div> <div class="syntax-name-format"> Syntax: </div> <pre class="syntax-box"> #include <time.h> time_t mktime( struct tm *time );</pre> <p>The mktime() function converts the local time in <em>time</em> to calendar time, and returns it. If there is an error, -1 is returned.</p> <div class="related-name-format"> Related topics: </div> <div class="related-content"> <a href="asctime.html">asctime</a><br> <a href="ctime.html">ctime</a><br> <a href="gmtime.html">gmtime</a><br> <a href="time.html">time</a> </div> </div> </td> </tr> </table></body></html><hr> <div class="name-format"> setlocale </div> <div class="syntax-name-format"> Syntax: </div> <pre class="syntax-box"> #include <locale.h> char *setlocale( int category, const char * locale );</pre> <p>The setlocale() function is used to set and retrieve the current locale. If <em>locale</em> is <strong>NULL</strong>, the current locale is returned. Otherwise, <em>locale</em> is used to set the locale for the given <em>category</em>.</p> <p><em>category</em> can have the following values:</p> <table class="code-table"> <tr> <th class="code-table-th">Value</th> <th class="code-table-th">Description</th> </tr> <tr> <td class="code-table-td">LC_ALL</td> <td class="code-table-td">All of the locale</td> </tr> <tr> <td class="code-table-td">LC_TIME</td> <td class="code-table-td">Date and time formatting</td> </tr> <tr> <td class="code-table-td">LC_NUMERIC</td> <td class="code-table-td">Number formatting</td> </tr> <tr> <td class="code-table-td">LC_COLLATE</td> <td class="code-table-td">String collation and regular expression matching</td> </tr> <tr> <td class="code-table-td">LC_C<a href= "../containers.html">TYPE</a></td> <td class="code-table-td">Regular expression matching, conversion, case-sensitive comparison, wide character functions, and character classification.</td> </tr> <tr> <td class="code-table-td">LC_MONETARY</td> <td class="code-table-td">For monetary formatting</td> </tr> <tr> <td class="code-table-td">LC_MESSAGES</td> <td class="code-table-td">For natural language messages</td> </tr> </table> <div class="related-name-format"> Related topics: </div> <div class="related-content"> (Standard C String and Character) <a href= "../stdstring/strcoll.html">strcoll</a> </div> </div> </td> </tr> </table></body></html><hr> <div class="name-format"> strftime </div> <div class="syntax-name-format"> Syntax: </div> <pre class="syntax-box"> #include <time.h> size_t strftime( char *str, size_t maxsize, const char *fmt, struct tm *time );</pre> <p>The function strftime() formats date and time information from <em>time</em> to a format specified by <em>fmt</em>, then stores the result in <em>str</em> (up to <em>maxsize</em> characters). Certain codes may be used in <em>fmt</em> to specify different types of time:</p> <table class="code-table"> <tr> <th class="code-table-th">Code</th> <th class="code-table-th">Meaning</th> </tr> <tr> <td class="code-table-td">%a</td> <td class="code-table-td">abbreviated weekday name (e.g. Fri)</td> </tr> <tr> <td class="code-table-td">%A</td> <td class="code-table-td">full weekday name (e.g. Friday)</td> </tr> <tr> <td class="code-table-td">%b</td> <td class="code-table-td">abbreviated month name (e.g. Oct)</td> </tr> <tr> <td class="code-table-td">%B</td> <td class="code-table-td">full month name (e.g. October)</td> </tr> <tr> <td class="code-table-td">%c</td> <td class="code-table-td">the standard date and time string</td> </tr> <tr> <td class="code-table-td">%d</td> <td class="code-table-td">day of the month, as a number (1-31)</td> </tr> <tr> <td class="code-table-td">%H</td> <td class="code-table-td">hour, 24 hour format (0-23)</td> </tr> <tr> <td class="code-table-td">%I</td> <td class="code-table-td">hour, 12 hour format (1-12)</td> </tr> <tr> <td class="code-table-td">%j</td> <td class="code-table-td">day of the year, as a number (1-366)</td> </tr> <tr> <td class="code-table-td">%m</td> <td class="code-table-td">month as a number (1-12). Note: some versions of Microsoft Visual C++ may use values that range from 0-11.</td> </tr> <tr> <td class="code-table-td">%M</td> <td class="code-table-td">minute as a number (0-59)</td> </tr> <tr> <td class="code-table-td">%p</td> <td class="code-table-td">locale's equivalent of AM or PM</td> </tr> <tr> <td class="code-table-td">%S</td> <td class="code-table-td">second as a number (0-59)</td> </tr> <tr> <td class="code-table-td">%U</td> <td class="code-table-td">week of the year, (0-53), where week 1 has the first Sunday</td> </tr> <tr> <td class="code-table-td">%w</td> <td class="code-table-td">weekday as a decimal (0-6), where Sunday is 0</td> </tr> <tr> <td class="code-table-td">%W</td> <td class="code-table-td">week of the year, (0-53), where week 1 has the first Monday</td> </tr> <tr> <td class="code-table-td">%x</td> <td class="code-table-td">standard date string</td> </tr> <tr> <td class="code-table-td">%X</td> <td class="code-table-td">standard time string</td> </tr> <tr> <td class="code-table-td">%y</td> <td class="code-table-td">year in decimal, without the century (0-99)</td> </tr> <tr> <td class="code-table-td">%Y</td> <td class="code-table-td">year in decimal, with the century</td> </tr> <tr> <td class="code-table-td">%Z</td> <td class="code-table-td">time zone name</td> </tr> <tr> <td class="code-table-td">%%</td> <td class="code-table-td">a percent sign</td> </tr> </table> <p>The strftime() function returns the number of characters put into <em>str</em>, or zero if an error occurs.</p> <div class="related-name-format"> Related topics: </div> <div class="related-content"> <a href="gmtime.html">gmtime</a><br> <a href="localtime.html">localtime</a><br> <a href="time.html">time</a> </div> </div> </td> </tr> </table></body></html><hr> <div class="name-format"> time </div> <div class="syntax-name-format"> Syntax: </div> <pre class="syntax-box"> #include <time.h> time_t time( time_t *time );</pre> <p>The function time() returns the current time, or -1 if there is an error. If the argument 'time' is given, then the current time is stored in 'time'.</p> <div class="related-name-format"> Related topics: </div> <div class="related-content"> <a href="asctime.html">asctime</a><br> <a href="clock.html">clock</a><br> <a href="ctime.html">ctime</a><br> <a href="difftime.html">difftime</a><br> <a href="gmtime.html">gmtime</a><br> <a href="localtime.html">localtime</a><br> <a href="mktime.html">mktime</a><br> (Other Standard C Functions) <a href= "../stdother/srand.html">srand</a><br> <a href="strftime.html">strftime</a> </div> </div> </td> </tr> </table></body></html><hr></body></html>⌨️ 快捷键说明
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