VC获取系统时间、程序运行时间
- 功能: 该函数根据系统时钟, 返回自UTC时间1970.1.1.00:00:00以来的秒数, 或者-1表示错误;
- 参数: timer指向存储时间的指针. 如果为空, 不存储返回值. 如, 可这么使用: time_t ltime = time(NULL);
- 说明: VC2005中, time是对_time64的封装, time_t默认等于__time64_t. 如果需要编译器把time_t解释为老的32位time_t, 则需要定义_USE_32BIT_TIME_T(64位平台可用), 但是不推荐这么做, 因为2038.1.18以后程序可能崩溃;
- 头文件: <time.h>.
// crt_times.c
// compile with: /W3
// This program demonstrates these time and date functions:
// time _ftime ctime_s asctime_s
// _localtime64_s _gmtime64_s mktime _tzset
// _strtime_s _strdate_s strftime
//
// Also the global variable:
// _tzname
//#include <time.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/timeb.h>
#include <string.h>int main()
{
char tmpbuf[128], timebuf[26], ampm[] = "AM";
time_t ltime;
struct _timeb tstruct;
struct tm today, gmt, xmas = { 0, 0, 12, 25, 11, 93 };
errno_t err;// Set time zone from TZ environment variable. If TZ is not set,
// the operating system is queried to obtain the default value
// for the variable.
//
_tzset();// Display operating system-style date and time.
_strtime_s( tmpbuf, 128 );
printf( "OS time:/t/t/t/t%s/n", tmpbuf );
_strdate_s( tmpbuf, 128 );
printf( "OS date:/t/t/t/t%s/n", tmpbuf );// Get UNIX-style time and display as number and string.
time( <ime );
printf( "Time in seconds since UTC 1/1/70:/t%ld/n", ltime );
err = ctime_s(timebuf, 26, <ime);
if (err)
{
printf("ctime_s failed due to an invalid argument.");
exit(1);
}
printf( "UNIX time and date:/t/t/t%s", timebuf );// Display UTC.
err = _gmtime64_s( &gmt, <ime );
if (err)
{
printf("_gmtime64_s failed due to an invalid argument.");
}
err = asctime_s(timebuf, 26, &gmt);
if (err)
{
printf("asctime_s failed due to an invalid argument.");
exit(1);
}
printf( "Coordinated universal time:/t/t%s", timebuf );// Convert to time structure and adjust for PM if necessary.
err = _localtime64_s( &today, <ime );
if (err)
{
printf("_localtime64_s failed due to an invalid argument.");
exit(1);
}
if( today.tm_hour >= 12 )
{
strcpy_s( ampm, sizeof(ampm), "PM" );
today.tm_hour -= 12;
}
if( today.tm_hour == 0 ) // Adjust if midnight hour.
today.tm_hour = 12;// Convert today into an ASCII string
err = asctime_s(timebuf, 26, &today);
if (err)
{
printf("asctime_s failed due to an invalid argument.");
exit(1);
}// Note how pointer addition is used to skip the first 11
// characters and printf is used to trim off terminating
// characters.
//
printf( "12-hour time:/t/t/t/t%.8s %s/n",
timebuf + 11, ampm );// Print additional time information.
_ftime( &tstruct ); // C4996
// Note: _ftime is deprecated; consider using _ftime_s instead
printf( "Plus milliseconds:/t/t/t%u/n", tstruct.millitm );
printf( "Zone difference in hours from UTC:/t%u/n",
tstruct.timezone/60 );
printf( "Time zone name:/t/t/t/t%s/n", _tzname[0] ); //C4996
// Note: _tzname is deprecated; consider using _get_tzname
printf( "Daylight savings:/t/t/t%s/n",
tstruct.dstflag ? "YES" : "NO" );// Make time for noon on Christmas, 1993.
if( mktime( &xmas ) != (time_t)-1 )
{
err = asctime_s(timebuf, 26, &xmas);
if (err)
{
printf("asctime_s failed due to an invalid argument.");
exit(1);
}
printf( "Christmas/t/t/t/t%s/n", timebuf );
}// Use time structure to build a customized time string.
err = _localtime64_s( &today, <ime );
if (err)
{
printf(" _localtime64_s failed due to invalid arguments.");
exit(1);
}// Use strftime to build a customized time string.
strftime( tmpbuf, 128,
"Today is %A, day %d of %B in the year %Y./n", &today );
printf( tmpbuf );
}输出:
OS time: 08:56:31
OS date: 12/15/09
Time in seconds since UTC 1/1/70: 1260838591
UNIX time and date: Tue Dec 15 08:56:31 2009
Coordinated universal time: Tue Dec 15 00:56:31 2009
12-hour time: 08:56:31 AM
Plus milliseconds: 46
Zone difference in hours from UTC: 4294967288
Time zone name: 中国标准时间
Daylight savings: NO
Christmas Sat Dec 25 12:00:00 1993Today is Tuesday, day 15 of December in the year 2009.
CString str;
//获取系统时间
CTime tm;
tm=CTime::GetCurrentTime();
str=tm.Format("现在时间是%Y年%m月%d日 %X");
MessageBox(str,NULL,MB_OK);
SYSTEMTIME st;
CString strDate,strTime;
GetLocalTime(&st);
strDate.Format("%4d-%2d-%2d",st.wYear,st.wMonth,st.wDay);
strTime.Format("%2d:%2d:%2d",st.wHour,st.wMinute,st.wSecond);
//获取程序运行时间
long t1=GetTickCount();//程序段开始前取得系统运行时间(ms)
Sleep(500);
long t2=GetTickCount();();//程序段结束后取得系统运行时间(ms)
str.Format("time:%dms",t2-t1);//前后之差即 程序运行时间
AfxMessageBox(str);
//获取系统运行时间
longt=GetTickCount();
CString str,str1;
str1.Format("系统已运行 %d时",t/3600000);
str=str1;
t%=3600000;
str1.Format("%d分",t/60000);
str+=str1;
t%=60000;
str1.Format("%d秒",t/1000);
str+=str1;
AfxMessageBox(str);5. 获取程序运行时间clock
// This example prompts for how long
// the program is to run and then continuously
// displays the elapsed time for that period.
//#include <stdio.h>
#include <stdlib.h>
#include <time.h>
void sleep( clock_t wait );
int main( void )
{
long i = 6000000L;
clock_t start, finish;
double duration;
// Delay for a specified time.
printf( "Delay for three seconds/n" );
sleep( (clock_t)3 * CLOCKS_PER_SEC );
printf( "Done!/n" );
// Measure the duration of an event.
printf( "Time to do %ld empty loops is ", i );
start = clock();
while( i-- )
;
finish = clock();
duration = (double)(finish - start) / CLOCKS_PER_SEC;
printf( "%2.1f seconds/n", duration );
}// Pauses for a specified number of milliseconds.
void sleep( clock_t wait )
{
clock_t goal;
goal = wait + clock();
while( goal > clock() )
;
}
输出:
Delay for three seconds
Done!
Time to do 6000000 empty loops is 0.1 seconds