blocks|key|769411|text|初始化now变量。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|769412|time_t+now+=+time(0);+//+Get+the+system+time|code-block|syntax|javascript|769413|localtime函数用于将传递的time_t中的时间值转换为struct+tm，它实际上并不检索系统时间。|769414|entityMap^0|3|3|0|0|0|9|H|6|V|9|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|S|8|@$9|T|A|U|B|C]|$9|V|A|W|B|C]|$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|M|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]]|N|$]]

Initialize your <code>now</code> variable.

<pre><code>time_t now = time(0); // Get the system time
</code></pre>

The <code>localtime</code> function is used to convert the time value in the passed <code>time_t</code> to a <code>struct tm</code>, it doesn't actually retrieve the system time.

blocks|key|769429|text|从here复制粘贴|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|769430|/*+localtime+example+*/
#include+<stdio.h>
#include+<time.h>

int+main+()
{
++time_t+rawtime;
++struct+tm+*+timeinfo;

++time+(+&rawtime+);
++timeinfo+=+localtime+(+&rawtime+);
++printf+(+"Current+local+time+and+date:+%25s",+asctime+(timeinfo)+);
++
++return+0;
}|code-block|syntax|javascript|769431|(只需将void添加到main()参数列表中，以便在C中工作)|style|CODE|769432|entityMap|0|LINK|mutability|MUTABLE|url|http://www.cplusplus.com/reference/clibrary/ctime/localtime/^0|1|4|0|0|0|4|4|B|6|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]]|C|$]]|$1|D|3|E|5|F|7|Y|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|Z|8|@$A|10|B|11|K|L]|$A|12|B|13|K|L]]|9|@]|C|$]]|$1|M|3|-4|5|6|7|14|8|@]|9|@]|C|$]]]|N|$O|$5|P|Q|R|C|$S|T]]]]

Copy-pasted from <a href="http://www.cplusplus.com/reference/clibrary/ctime/localtime/" rel="noreferrer">here</a>:
<pre><code>/* localtime example */
#include &lt;stdio.h&gt;
#include &lt;time.h&gt;

int main ()
{
 time_t rawtime;
 struct tm * timeinfo;

 time ( &amp;rawtime );
 timeinfo = localtime ( &amp;rawtime );
 printf ( &quot;Current local time and date: %s&quot;, asctime (timeinfo) );
 
 return 0;
}
</code></pre>
(just add <code>void</code> to the <code>main()</code> arguments list in order for this to work in C)

blocks|key|984469|text|简单的方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|984470|#include+<time.h>
#include+<stdio.h>
#include+<string.h>

int+main(void)
{
++++time_t+mytime+=+time(NULL);
++++char+*+time_str+=+ctime(&mytime);
++++time_str[strlen(time_str)-1]+=+'\0';
++++printf("Current+Time+:+%25s\n",+time_str);

++++return+0;
}|code-block|syntax|javascript|984471|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Easy way:
<pre><code>#include &lt;time.h&gt;
#include &lt;stdio.h&gt;
#include &lt;string.h&gt;

int main(void)
{
 time_t mytime = time(NULL);
 char * time_str = ctime(&amp;mytime);
 time_str[strlen(time_str)-1] = '\0';
 printf(&quot;Current Time : %s\n&quot;, time_str);

 return 0;
}
</code></pre>

blocks|key|769499|text|伙计们，我有了一个新的方法来获得系统时间。虽然它冗长，充满了愚蠢的作品，但通过这种方式，你可以获得整数格式的系统时间。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|769500|#include+<stdio.h>
#include+<stdlib.h>

int+main()
{
++++FILE+*fp;
++++char+hc1,hc2,mc1,mc2;
++++int+hi1,hi2,mi1,mi2,hour,minute;
++++system("echo+%25time%25+>time.txt");
++++fp=fopen("time.txt","r");
++++if(fp==NULL)
+++++++exit(1)+;
++++hc1=fgetc(fp);
++++hc2=fgetc(fp);
++++fgetc(fp);
++++mc1=fgetc(fp);
++++mc2=fgetc(fp);
++++fclose(fp);
++++remove("time.txt");
++++hi1=hc1;
++++hi2=hc2;
++++mi1=mc1;
++++mi2=mc2;
++++hi1-=48;
++++hi2-=48;
++++mi1-=48;
++++mi2-=48;
++++hour=hi1*10%2Bhi2;
++++minute=mi1*10%2Bmi2;
++++printf("Current+time+is+%25d:%25d\n",hour,minute);
++++return+0;
}|code-block|syntax|javascript|769501|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

guys i got a new way get system time. though its lengthy and is full of silly works but in this way you can get system time in integer format.

<pre><code>#include &lt;stdio.h&gt;
#include &lt;stdlib.h&gt;

int main()
{
 FILE *fp;
 char hc1,hc2,mc1,mc2;
 int hi1,hi2,mi1,mi2,hour,minute;
 system("echo %time% &gt;time.txt");
 fp=fopen("time.txt","r");
 if(fp==NULL)
 exit(1) ;
 hc1=fgetc(fp);
 hc2=fgetc(fp);
 fgetc(fp);
 mc1=fgetc(fp);
 mc2=fgetc(fp);
 fclose(fp);
 remove("time.txt");
 hi1=hc1;
 hi2=hc2;
 mi1=mc1;
 mi2=mc2;
 hi1-=48;
 hi2-=48;
 mi1-=48;
 mi2-=48;
 hour=hi1*10+hi2;
 minute=mi1*10+mi2;
 printf("Current time is %d:%d\n",hour,minute);
 return 0;
}
</code></pre>

blocks|key|769509|text|#include+<stdio.h>
#include+<time.h>

void+main()
{
++++time_t+t;
++++time(&t);
++++clrscr();

++++printf("Today's+date+and+time+:+%25s",ctime(&t));
++++getch();
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|769510|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>#include &lt;stdio.h&gt;
#include &lt;time.h&gt;

void main()
{
 time_t t;
 time(&amp;t);
 clrscr();

 printf("Today's date and time : %s",ctime(&amp;t));
 getch();
}
</code></pre>

blocks|key|984571|text|为了扩展上面@mingos的答案，我编写了下面的函数来将我的时间格式化为特定的格式(dd+mm+yyyy+hh:mm:ss)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|984572|//+Store+the+formatted+string+of+time+in+the+output
void+format_time(char+*output){
++++time_t+rawtime;
++++struct+tm+*+timeinfo;

++++time+(+&rawtime+);
++++timeinfo+=+localtime+(+&rawtime+);

++++sprintf(output,+"[%25d+%25d+%25d+%25d:%25d:%25d]",timeinfo->tm_mday,+timeinfo->tm_mon+%2B+1,+timeinfo->tm_year+%2B+1900,+timeinfo->tm_hour,+timeinfo->tm_min,+timeinfo->tm_sec);
}|code-block|syntax|javascript|984573|有关struct+tm的更多信息，请访问here。|offset|length|style|CODE|984574|entityMap|0|LINK|mutability|MUTABLE|url|http://linux.die.net/man/3/ctime^0|0|0|2|9|K|4|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@$I|X|J|Y|K|L]]|9|@$I|Z|J|10|1|11]]|A|$]]|$1|M|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

To extend the answer from @mingos above, I wrote the below function to format my time to a specific format ([dd mm yyyy hh:mm:ss]).

<pre><code>// Store the formatted string of time in the output
void format_time(char *output){
 time_t rawtime;
 struct tm * timeinfo;

 time ( &amp;rawtime );
 timeinfo = localtime ( &amp;rawtime );

 sprintf(output, "[%d %d %d %d:%d:%d]",timeinfo-&gt;tm_mday, timeinfo-&gt;tm_mon + 1, timeinfo-&gt;tm_year + 1900, timeinfo-&gt;tm_hour, timeinfo-&gt;tm_min, timeinfo-&gt;tm_sec);
}
</code></pre>

More information about <code>struct tm</code> can be found <a href="http://linux.die.net/man/3/ctime" rel="noreferrer">here</a>.

blocks|key|984615|text|您可以使用此函数来获取当前本地时间。如果你想要gmt，那么使用gmtime函数而不是localtime。干杯|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|984616|time_t+my_time;
struct+tm+*+timeinfo;+
time+(&my_time);
timeinfo+=+localtime+(&my_time);
CCLog("year->%25d",timeinfo->tm_year%2B1900);
CCLog("month->%25d",timeinfo->tm_mon%2B1);
CCLog("date->%25d",timeinfo->tm_mday);
CCLog("hour->%25d",timeinfo->tm_hour);
CCLog("minutes->%25d",timeinfo->tm_min);
CCLog("seconds->%25d",timeinfo->tm_sec);|code-block|syntax|javascript|984617|entityMap^0|V|6|16|9|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|L|$]]

You can use this function to get current local time. if you want gmt then use the <code>gmtime</code> function instead of <code>localtime</code>. cheers
<pre><code>time_t my_time;
struct tm * timeinfo; 
time (&amp;my_time);
timeinfo = localtime (&amp;my_time);
CCLog(&quot;year-&gt;%d&quot;,timeinfo-&gt;tm_year+1900);
CCLog(&quot;month-&gt;%d&quot;,timeinfo-&gt;tm_mon+1);
CCLog(&quot;date-&gt;%d&quot;,timeinfo-&gt;tm_mday);
CCLog(&quot;hour-&gt;%d&quot;,timeinfo-&gt;tm_hour);
CCLog(&quot;minutes-&gt;%d&quot;,timeinfo-&gt;tm_min);
CCLog(&quot;seconds-&gt;%d&quot;,timeinfo-&gt;tm_sec);
</code></pre>

blocks|key|769886|text|#include<stdio.h>
#include<time.h>

void+main()
{
++++time_t+t;
++++time(&t);
++++printf("\n+current+time+is+:+%25s",ctime(&t));
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|769887|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>#include&lt;stdio.h&gt;
#include&lt;time.h&gt;

void main()
{
 time_t t;
 time(&amp;t);
 printf("\n current time is : %s",ctime(&amp;t));
}
</code></pre>

blocks|key|984662|text|如果你只是需要没有日期的时间。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|984663|++time_t+rawtime;
++struct+tm+*+timeinfo;
++time(+&rawtime+);
++timeinfo+=+localtime(+&rawtime+);
++printf("%2502d:%2502d:%2502d",+timeinfo->tm_hour,+timeinfo->tm_min,+
++++timeinfo->tm_sec);|code-block|syntax|javascript|984664|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

If you just need the time without the date.

<pre><code> time_t rawtime;
 struct tm * timeinfo;
 time( &amp;rawtime );
 timeinfo = localtime( &amp;rawtime );
 printf("%02d:%02d:%02d", timeinfo-&gt;tm_hour, timeinfo-&gt;tm_min, 
 timeinfo-&gt;tm_sec);
</code></pre>

blocks|key|769940|text|建议使用localtime_s而不是localtime。这应该是可行的。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|769941|time_t+current_raw_time+=+time(0);+//+System+time:+number+of+seconds+since+00:00,+Jan+1+1970+UTC
struct+tm+day_time;
localtime_s(&day_time,+&current_raw_time);|code-block|syntax|javascript|769942|day_time将拥有以下成员：|769943|struct+tm
{
++++int+tm_sec;+++//+seconds+after+the+minute+-+[0,+60]+including+leap+second
++++int+tm_min;+++//+minutes+after+the+hour+-+[0,+59]
++++int+tm_hour;++//+hours+since+midnight+-+[0,+23]
++++int+tm_mday;++//+day+of+the+month+-+[1,+31]
++++int+tm_mon;+++//+months+since+January+-+[0,+11]
++++int+tm_year;++//+years+since+1900
++++int+tm_wday;++//+days+since+Sunday+-+[0,+6]
++++int+tm_yday;++//+days+since+January+1+-+[0,+365]
++++int+tm_isdst;+//+daylight+savings+time+flag
};|769944|请注意，localtime不提供毫秒。|769945|entityMap^0|4|B|I|9|0|0|0|8|0|0|4|9|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|M|3|N|5|H|7|11|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|12|8|@$9|13|A|14|B|C]]|D|@]|E|$]]|$1|Q|3|-4|5|6|7|15|8|@]|D|@]|E|$]]]|R|$]]

It is recommonded to use <code>localtime_s</code> instead of <code>localtime</code>.
This should work.
<pre><code>time_t current_raw_time = time(0); // System time: number of seconds since 00:00, Jan 1 1970 UTC
struct tm day_time;
localtime_s(&amp;day_time, &amp;current_raw_time);
</code></pre>
<code>day_time</code> will have the following members:
<pre><code>struct tm
{
 int tm_sec; // seconds after the minute - [0, 60] including leap second
 int tm_min; // minutes after the hour - [0, 59]
 int tm_hour; // hours since midnight - [0, 23]
 int tm_mday; // day of the month - [1, 31]
 int tm_mon; // months since January - [0, 11]
 int tm_year; // years since 1900
 int tm_wday; // days since Sunday - [0, 6]
 int tm_yday; // days since January 1 - [0, 365]
 int tm_isdst; // daylight savings time flag
};
</code></pre>
Note that, <code>localtime</code> does not provide milliseconds.

I want to get the current time of my system. For that I'm using the following code in C:

<pre><code>time_t now;
struct tm *mytime = localtime(&amp;now); 
if ( strftime(buffer, sizeof buffer, "%X", mytime) )
{
 printf("time1 = \"%s\"\n", buffer);
}
</code></pre>

The problem is that this code is giving some random time. Also, the random time is different everytime. I want the current time of my system.

Get the current time in C

我想要获取我的系统的当前时间。为此，我在C中使用了以下代码：time_t now;struct tm *mytime = localtime(&now); if ( strftime(buffer, sizeof buffer, "%X", mytime) ){    printf("time1 = \"%s\"\n"...

问获取C语言中的当前时间
EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问获取C语言中的当前时间EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问获取C语言中的当前时间
EN