CTime类format的使用
Theformatargument consists of one or more codes; as inprintf, the formatting codes are preceded by a percent sign (%). Characters that do not begin with%are copied unchanged tostrDest.TheLC_TIMEcategory of the current locale affects the output formatting ofstrftime.(For more information onLC_TIME, seesetlocale.) The formatting codes forstrftimeare 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 theprintffunction, 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:/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: 14:15:49
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
源文档 <http://www.cnblogs.com/Richinger/archive/2005/04/07/133162.html>