[转]VC++中CTime类format的使用

From: http://www.cnblogs.com/chenhs/archive/2008/08/19/1270763.html

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 code	Meaning
%#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

Routine	Required header	Compatibility
strftime	<time.h>	ANSI, Win 98, Win Me, Win NT, Win 2000, Win XP
wcsftime	<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:tttt%sn", tmpbuf );
                _strdate( tmpbuf );
                printf( "OS date:tttt%sn", tmpbuf );
                
                /* Get UNIX-style time and display as number and string. */
                _time64( &ltime );
                printf( "Time in seconds since UTC 1/1/70:t%ldn", ltime );
                printf( "UNIX time and date:ttt%s", _ctime64( &ltime ) );
                
                /* Display UTC. */
                gmt = _gmtime64( &ltime );
                printf( "Coordinated universal time:tt%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:tttt%.8s %sn",
                asctime( today ) + 11, ampm );
                
                /* Print additional time information. */
                _ftime64( &tstruct );
                printf( "Plus milliseconds:ttt%un", tstruct.millitm );
                printf( "Zone difference in hours from UTC:t%un", 
                tstruct.timezone/60 );
                printf( "Time zone name:tttt%sn", _tzname[0] );
                printf( "Daylight savings:ttt%sn", 
                tstruct.dstflag   "YES" : "NO" );
                
                /* Make time for noon on Christmas, 1993. */
                if( _mktime64( &xmas ) != (__time64_t)-1 )
                printf( "Christmastttt%sn", 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:                                14:15:49
                OS date:                                02/07/02
                Time in seconds since UTC 1/1/70:       1013120149
                UNIX time and date:                     Thu Feb 07 14:15:49 2002
                Coordinated universal time:             Thu Feb 07 22:15:49 2002
                12-hour time:                           02:15:49 PM
                Plus milliseconds:                      455
                Zone difference in hours from UTC:      8
                Time zone name:                         Pacific Standard Time
                Daylight savings:                       NO
                Christmas                               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);

format中参数的含义见上面的说明