使用CTime类可以很方便地取得当前系统时间并转换为各种格式
The format argument consists of one or more codes; as in printf, the formatting codes are preceded by a percent sign (%). Characters that do not begin with % are copied unchanged to strDest. The LC_TIME category of the current locale affects the output formatting of strftime.(For more information on LC_TIME, see setlocale.) The formatting codes for strftime are listed below:
%a
Abbreviated weekday name
%A
Full weekday name
%b
Abbreviated month name
%B
Full month name
%c
Date and time representation appropriate for locale
%d
Day of month as decimal number (01 – 31)
%H
Hour in 24-hour format (00 – 23)
%I
Hour in 12-hour format (01 – 12)
%j
Day of year as decimal number (001 – 366)
%m
Month as decimal number (01 – 12)
%M
Minute as decimal number (00 – 59)
%p
Current locale's A.M./P.M. indicator for 12-hour clock
%S
Second as decimal number (00 – 59)
%U
Week of year as decimal number, with Sunday as first day of week (00 – 53)
%w
Weekday as decimal number (0 – 6; Sunday is 0)
%W
Week of year as decimal number, with Monday as first day of week (00 – 53)
%x
Date representation for current locale
%X
Time representation for current locale
%y
Year without century, as decimal number (00 – 99)
%Y
Year with century, as decimal number
%z,
%Z
Either the time-zone name or time zone abbreviation, depending on registry settings; no characters if time zone is unknown
%%
Percent sign
As in the printf function, the # flag may prefix any formatting code. In that case, the meaning of the format code is changed as follows.
Format codeMeaning%#a, %#A, %#b, %#B, %#p, %#X, %#z, %#Z, %#% # flag is ignored. %#c Long date and time representation, appropriate for current locale. For example: "Tuesday, March 14, 1995, 12:41:29".%#x Long date representation, appropriate to current locale. For example: "Tuesday, March 14, 1995".%#d, %#H, %#I, %#j, %#m, %#M, %#S, %#U, %#w, %#W, %#y, %#Y Remove leading zeros (if any).
Requirements
RoutineRequired headerCompatibilitystrftime <time.h>ANSI, Win 98, Win Me, Win NT, Win 2000, Win XPwcsftime <time.h> or <wchar.h>ANSI, Win 98, Win Me, Win NT, Win 2000, Win XP
Example
// crt_times.c/* This program demonstrates these time and date functions: * _time64 _ftime64 _ctime64 asctime * _localtime64 _gmtime64 _mktime64 _tzset * _strtime _strdate strftime * * Also the global variable: * _tzname */#include <time.h>#include <stdio.h>#include <sys/types.h>#include <sys/timeb.h>#include <string.h>int main(){ char tmpbuf[128], ampm[] = "AM"; __time64_t ltime; struct __timeb64 tstruct; struct tm *today, *gmt, xmas = { 0, 0, 12, 25, 11, 93 }; /* 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( tmpbuf ); printf( "OS time:/t/t/t/t%s/n", tmpbuf ); _strdate( tmpbuf ); printf( "OS date:/t/t/t/t%s/n", tmpbuf ); /* Get UNIX-style time and display as number and string. */ _time64( <ime ); printf( "Time in seconds since UTC 1/1/70:/t%ld/n", ltime ); printf( "UNIX time and date:/t/t/t%s", _ctime64( <ime ) ); /* Display UTC. */ gmt = _gmtime64( <ime ); printf( "Coordinated universal time:/t/t%s", asctime( gmt ) ); /* Convert to time structure and adjust for PM if necessary. */ today = _localtime64( <ime ); if( today->tm_hour >= 12 ) { strcpy( ampm, "PM" ); today->tm_hour -= 12; } if( today->tm_hour == 0 ) /* Adjust if midnight hour. */ today->tm_hour = 12; /* 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", asctime( today ) + 11, ampm ); /* Print additional time information. */ _ftime64( &tstruct ); 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] ); printf( "Daylight savings:/t/t/t%s/n", tstruct.dstflag ? "YES" : "NO" ); /* Make time for noon on Christmas, 1993. */ if( _mktime64( &xmas ) != (__time64_t)-1 ) printf( "Christmas/t/t/t/t%s/n", asctime( &xmas ) ); /* Use time structure to build a customized time string. */ today = _localtime64( <ime ); /* 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 );}
Sample Output
OS time: 14:15:49OS date: 02/07/02Time in seconds since UTC 1/1/70: 1013120149UNIX time and date: Thu Feb 07 14:15:49 2002Coordinated universal time: Thu Feb 07 22:15:49 200212-hour time: 02:15:49 PMPlus milliseconds: 455Zone difference in hours from UTC: 8Time zone name: Pacific Standard TimeDaylight savings: NOChristmas Sat Dec 25 12:00:00 1993
简单点的如下: CString msg1="aaaaaaaaaaa"; KillTimer(1); CTime t = CTime::GetCurrentTime(); char szTime[8]; int nHour = t.GetHour(); int nMinute = t.GetMinute(); int nSecond = t.GetSecond(); wsprintf(szTime, "i:i:i", nHour, nMinute,nSecond);//分秒一般习惯用两位表 m_edit1=szTime; UpdateData (FALSE); SetTimer(1, 1000,NULL); msg1=t.Format("%d-%m-%y"); //可以看到format的功能 MessageBox(msg1);
