CTime类format的使用

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( &ltime );    printf( "Time in seconds since UTC 1/1/70:/t%ld/n", ltime );    printf( "UNIX time and date:/t/t/t%s", _ctime64( &ltime ) );    /* Display UTC. */    gmt = _gmtime64( &ltime );    printf( "Coordinated universal time:/t/t%s", asctime( gmt ) );    /* Convert to time structure and adjust for PM if necessary. */    today = _localtime64( &ltime );    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( &ltime );    /* 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, "%02i:%02i:%02i", 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);