?? 04.html
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<div align="right"><font face='宋體' size='2'> 返回值 </font> </div>
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<td valign="top"> <font face='宋體' size='2'> 返回結(jié)構(gòu)tm代表目前UTC 時(shí)間<br>
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<div align="right"><font face='宋體' size='2'> 范例 </font> </div>
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<td valign="top"> <font face='宋體' size='2'> #include <time.h><br>
main(){<br>
char *wday[]={"Sun","Mon","Tue","Wed","Thu","Fri","Sat"};<br>
time_t timep;<br>
struct tm *p;<br>
time(&timep);<br>
p=gmtime(&timep);<br>
printf(“%d%d%d”,(1900+p->tm_year), (1+p->tm_mon),p->tm_mday);<br>
printf(“%s%d;%d;%d\n”, wday[p->tm_wday], p->tm_hour, p->tm_min,
p->tm_sec);<br>
}<br>
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<div align="right"><font face='宋體' size='2'> 執(zhí)行 </font> </div>
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<td valign="top"> <font face='宋體' size='2'> 2000/10/28 Sat 8:15:38<br>
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<div align="right"><br>
<font face='宋體' size='2'><a name=linuxc36></a></font> </div>
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<div align="right"><font face='宋體' size='2'> <br>
</font> </div>
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<td valign="top"> <font face='宋體' size='2'> <br>
localtime（取得當(dāng)?shù)啬壳皶r(shí)間和日期） </font> </td>
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<td width="80" valign="top">
<div align="right"><font face='宋體' size='2'> 相關(guān)函數(shù) </font> </div>
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<td valign="top"> <font face='宋體' size='2'> time, asctime, ctime, gmtime<br>
</font> </td>
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<td width="80" valign="top">
<div align="right"><font face='宋體' size='2'> 表頭文件 </font> </div>
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<td valign="top"> <font face='宋體' size='2'> #include<time.h><br>
</font> </td>
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<td width="80" valign="top">
<div align="right"><font face='宋體' size='2'> 定義函數(shù) </font> </div>
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<td valign="top"> <font face='宋體' size='2'> struct tm *localtime(const time_t
* timep);<br>
</font> </td>
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<div align="right"><font face='宋體' size='2'> 函數(shù)說(shuō)明 </font> </div>
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<td valign="top"> <font face='宋體' size='2'> localtime()將參數(shù)timep所指的time_t結(jié)構(gòu)中的信息轉(zhuǎn)換成真實(shí)世界所使用的時(shí)間日期表示方法，然后將結(jié)果由結(jié)構(gòu)tm返回。結(jié)構(gòu)tm的定義請(qǐng)參考gmtime()。此函數(shù)返回的時(shí)間日期已經(jīng)轉(zhuǎn)換成當(dāng)?shù)貢r(shí)區(qū)。<br>
</font> </td>
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<td width="80" valign="top">
<div align="right"><font face='宋體' size='2'> 返回值 </font> </div>
</td>
<td valign="top"> <font face='宋體' size='2'> 返回結(jié)構(gòu)tm代表目前的當(dāng)?shù)貢r(shí)間。<br>
</font> </td>
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<td width="80" valign="top">
<div align="right"><font face='宋體' size='2'> 范例 </font> </div>
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<td valign="top"> <font face='宋體' size='2'> #include<time.h><br>
main(){<br>
char *wday[]={“Sun”,”Mon”,”Tue”,”Wed”,”Thu”,”Fri”,”Sat”};<br>
time_t timep;<br>
struct tm *p;<br>
time(&timep);<br>
p=localtime(&timep); /*取得當(dāng)?shù)貢r(shí)間*/<br>
printf (“%d%d%d ”, (1900+p->tm_year),( l+p->tm_mon), p->tm_mday);<br>
printf(“%s%d:%d:%d\n”, wday[p->tm_wday],p->tm_hour, p->tm_min,
p->tm_sec);<br>
}<br>
</font> </td>
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<td width="80" valign="top">
<div align="right"><font face='宋體' size='2'> 執(zhí)行 </font> </div>
</td>
<td valign="top"> <font face='宋體' size='2'> 2000/10/28 Sat 11:12:22<br>
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<div align="right"><br>
<font face='宋體' size='2'><a name=linuxc37></a></font> </div>
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<td width="80" valign="top">
<div align="right"><font face='宋體' size='2'> <br>
</font> </div>
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<td valign="top"> <font face='宋體' size='2'> <br>
mktime（將時(shí)間結(jié)構(gòu)數(shù)據(jù)轉(zhuǎn)換成經(jīng)過(guò)的秒數(shù)） </font> </td>
</tr>
<tr>
<td width="80" valign="top">
<div align="right"><font face='宋體' size='2'> 相關(guān)函數(shù) </font> </div>
</td>
<td valign="top"> <font face='宋體' size='2'> time，asctime，gmtime，localtime<br>
</font> </td>
</tr>
<tr>
<td width="80" valign="top">
<div align="right"><font face='宋體' size='2'> 表頭文件 </font> </div>
</td>
<td valign="top"> <font face='宋體' size='2'> #include<time.h><br>
</font> </td>
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<td width="80" valign="top">
<div align="right"><font face='宋體' size='2'> 定義函數(shù) </font> </div>
</td>
<td valign="top"> <font face='宋體' size='2'> time_t mktime(strcut tm * timeptr);<br>
</font> </td>
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<td width="80" valign="top">
<div align="right"><font face='宋體' size='2'> 函數(shù)說(shuō)明 </font> </div>
</td>
<td valign="top"> <font face='宋體' size='2'> mktime()用來(lái)將參數(shù)timeptr所指的tm結(jié)構(gòu)數(shù)據(jù)轉(zhuǎn)換成從公元1970年1月1日0時(shí)0分0
秒算起至今的UTC時(shí)間所經(jīng)過(guò)的秒數(shù)。<br>
</font> </td>
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<td width="80" valign="top">
<div align="right"><font face='宋體' size='2'> 返回值 </font> </div>
</td>
<td valign="top"> <font face='宋體' size='2'> 返回經(jīng)過(guò)的秒數(shù)。<br>
</font> </td>
</tr>
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<td width="80" valign="top">
<div align="right"><font face='宋體' size='2'> 范例 </font> </div>
</td>
<td valign="top"> <font face='宋體' size='2'> /* 用time()取得時(shí)間（秒數(shù)），利用localtime()<br>
轉(zhuǎn)換成struct tm 再利用mktine（）將struct tm轉(zhuǎn)換成原來(lái)的秒數(shù)*/<br>
#include<time.h><br>
main()<br>
{<br>
time_t timep;<br>
strcut tm *p;<br>
time(&timep);<br>
printf(“time() : %d \n”,timep);<br>
p=localtime(&timep);<br>
timep = mktime(p);<br>
printf(“time()->localtime()->mktime():%d\n”,timep);<br>
}<br>
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<td width="80" valign="top">
<div align="right"><font face='宋體' size='2'> 執(zhí)行 </font> </div>
</td>
<td valign="top"> <font face='宋體' size='2'> time():974943297<br>
time()->localtime()->mktime():974943297<br>
</font> </td>
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<td width="80" valign="top">
<div align="right"><br>
<font face='宋體' size='2'><a name=linuxc38></a></font> </div>
</td>
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<td width="80" valign="top">
<div align="right"><font face='宋體' size='2'> <br>
</font> </div>
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<td valign="top"> <font face='宋體' size='2'> <br>
settimeofday（設(shè)置目前時(shí)間） </font> </td>
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<tr>
<td width="80" valign="top">
<div align="right"><font face='宋體' size='2'> 相關(guān)函數(shù) </font> </div>
</td>
<td valign="top"> <font face='宋體' size='2'> time，ctime，ftime，gettimeofday<br>
</font> </td>
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<td width="80" valign="top">
<div align="right"><font face='宋體' size='2'> 表頭文件 </font> </div>
</td>
<td valign="top"> <font face='宋體' size='2'> #include<sys/time.h><br>
#include<unistd.h><br>
</font> </td>
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<td width="80" valign="top">
<div align="right"><font face='宋體' size='2'> 定義函數(shù) </font> </div>
</td>
<td valign="top"> <font face='宋體' size='2'> int settimeofday ( const struct
timeval *tv,const struct timezone *tz);<br>
</font> </td>
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<td width="80" valign="top">
<div align="right"><font face='宋體' size='2'> 函數(shù)說(shuō)明 </font> </div>
</td>
<td valign="top"> <font face='宋體' size='2'> settimeofday()會(huì)把目前時(shí)間設(shè)成由tv所指的結(jié)構(gòu)信息，當(dāng)?shù)貢r(shí)區(qū)信息則設(shè)成tz所指的結(jié)構(gòu)。詳細(xì)的說(shuō)明請(qǐng)參考gettimeofday()。注意，只有root權(quán)限才能使用此函數(shù)修改時(shí)間。<br>
</font> </td>
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<td width="80" valign="top">
<div align="right"><font face='宋體' size='2'> 返回值 </font> </div>
</td>
<td valign="top"> <font face='宋體' size='2'> 成功則返回0，失敗返回－1，錯(cuò)誤代碼存于errno。<br>
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<div align="right"><font face='宋體' size='2'> 錯(cuò)誤代碼 </font> </div>
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<td valign="top"> <font face='宋體' size='2'> EPERM 并非由root權(quán)限調(diào)用settimeofday（），權(quán)限不夠。<br>
EINVAL 時(shí)區(qū)或某個(gè)數(shù)據(jù)是不正確的，無(wú)法正確設(shè)置時(shí)間。<br>
</font> </td>
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<td width="80" valign="top">
<div align="right"><br>
<font face='宋體' size='2'><a name=linuxc39></a></font> </div>
</td>
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<td width="80" valign="top">
<div align="right"><font face='宋體' size='2'> <br>
</font> </div>
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<td valign="top"> <font face='宋體' size='2'> <br>
time（取得目前的時(shí)間） </font> </td>
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<td width="80" valign="top">
<div align="right"><font face='宋體' size='2'> 相關(guān)函數(shù) </font> </div>
</td>
<td valign="top"> <font face='宋體' size='2'> ctime，ftime，gettimeofday<br>
</font> </td>
</tr>
<tr>
<td width="80" valign="top">
<div align="right"><font face='宋體' size='2'> 表頭文件 </font> </div>
</td>
<td valign="top"> <font face='宋體' size='2'> #include<time.h><br>
</font> </td>
</tr>
<tr>
<td width="80" valign="top">
<div align="right"><font face='宋體' size='2'> 定義函數(shù) </font> </div>
</td>
<td valign="top"> <font face='宋體' size='2'> time_t time(time_t *t);<br>
</font> </td>
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<td width="80" valign="top">
<div align="right"><font face='宋體' size='2'> 函數(shù)說(shuō)明 </font> </div>
</td>
<td valign="top"> <font face='宋體' size='2'> 此函數(shù)會(huì)返回從公元1970年1月1日的UTC時(shí)間從0時(shí)0分0秒算起到現(xiàn)在所經(jīng)過(guò)的秒數(shù)。如果t
并非空指針的話，此函數(shù)也會(huì)將返回值存到t指針?biāo)傅膬?nèi)存。<br>
</font> </td>
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<td width="80" valign="top">
<div align="right"><font face='宋體' size='2'> 返回值 </font> </div>
</td>
<td valign="top"> <font face='宋體' size='2'> 成功則返回秒數(shù)，失敗則返回((time_t)-1)值，錯(cuò)誤原因存于errno中。<br>
</font> </td>
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<td width="80" valign="top">
<div align="right"><font face='宋體' size='2'> 范例 </font> </div>
</td>
<td valign="top"> <font face='宋體' size='2'> #include<time.h><br>
mian()<br>
{<br>
int seconds= time((time_t*)NULL);<br>
printf(“%d\n”,seconds);<br>
}<br>
</font> </td>
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<td width="80" valign="top">
<div align="right"><font face='宋體' size='2'> 執(zhí)行 </font> </div>
</td>
<td valign="top"> <font face='宋體' size='2'> 9.73E+08<br>
</font> </td>
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<div align="right"><br>
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