读取系统时间-----CTime类的应用和输出格式

先看看代码再说吧：


void CTest9Dlg::OnButton1()






{


// TODO: Add your control notification handler code here


myTime = CTime::GetCurrentTime();


CString myStr = myTime.Format("%Y年%m月%d日 %X");


SetDlgItemText(IDC_EDIT1,myStr);


}



仅仅是上面这个简单的代码，就可以实现输出当前的时间，具体来说就是年月日和时分秒了。

需要注意的当然是两个：
1.得到当前的时间。调用CTime::GetCurrentTime()函数来实现。
不用惊奇，这里的变量myTime是我手动加在类中的一个成员，而点击button函数中，只是对它进行了初始化。

2.输出格式的问题，以下内容节选自MSDN：


%D Total days in this CTime






%H Hours in the current day






%M Minutes in the current hour






%S Seconds in the current minute






%% Percent sign




上面的是CTime.Formate的改变后的输出格式，而下面的依旧可以用，没有改变，继承了下来。




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




Time-zone name or abbreviation; 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.