CTime( ) throw( );
CTime(
__time64_t time
) throw( );
CTime(
int nYear,
int nMonth,
int nDay,
int nHour,
int nMin,
int nSec,
int nDST = -1
);
CTime(
WORD wDosDate,
WORD wDosTime,
int nDST = -1
);
CTime(
const SYSTEMTIME& st,
int nDST = - 1
) throw( );
CTime(
const FILETIME& ft,
int nDST = - 1
);
CTime(
const DBTIMESTAMP& dbts,
int nDST = -1
) throw( );
nDST
Indicates whether daylight savings time is in effect. Can have one of three values:
- nDST set to 0 Standard time is in effect.
- nDST set to a value greater than 0 Daylight savings time is in effect.
- nDST set to a value less than 0 The default. Automatically computes whether standard time or daylight savings time is in effect.
初始化 m_begintime=CTime(2004,1,1,0,0,0,-1);//参数依次为
year,month,day,hour,minite,second,nDST
m_endtime =CTime::GetCurrentTime();//当前时间
2.日期比较
CTimeSpan span;
span=time1-time2;
得到两时间的间隔.
可以取得span.GetHours().等
3.access数据库查询
使用DateDiff()函数,具体参照access帮助
CString timesql;
timesql.Format(" Where DateDiff('d',%s,'%s')<=0","日期",m_begintime.Format("%Y-%m-%d"));
4读取日期字段(odbc)
CDBVariant var;
recset.GetFieldValue(i,var);
s.Format("%d-%d-%d",(var.m_pdate)->year,(var.m_pdate)->month,
(var.m_pdate)->day);
5.CTime转换为CString
例:
m_begintime.Format("%Y-%m-%d");// 2004-10-03
6.CString转换为CTime
//s="2004-10-5"
int first=s.Find('-');
int second=s.Find('-',first+1);
int year=atoi(s.Left(4));
int month=atoi(s.Mid(first+1,second-first+1));
int day=atoi(s.Mid(second+1,s.GetLength()-second-1));
CTime temp(year,month,day,0,0,0);
7.判断CString是否表示的正确日期格式
//判断是否为2004-01-13 ch 可代表其他分隔符
bool IsDate(CString str,char ch)
{
if(str.IsEmpty()) return false;
//日期分段
int first=str.Find(ch);
int second=str.Find(ch,first+1);
int year=atoi(str.Left(4));
int month=atoi(str.Mid(first+1,second-first+1));
int day=atoi(str.Mid(second+1,str.GetLength()-second-1));
//判断
if (year < 2000 || year >= 2010)
{
return false;
}
else if (month< 1 || month >12)
{
return false;
}
else if (day< 1 || day > 31)
{
return false;
}
else if (month == 4 || month == 6 || month == 9 || month == 11)
{
if(day > 30)
{
return false;
}
else
{
return true;
}
}
else if (month == '2')
{
if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0)
{
if (day>29)
{
return false;
}
else
{
return true;
}
}
else if (day>28)
{
return false;
}
return true;
}
else
{
return true;
}
}
用VC编写数据库程序不可避免的会遇到_bstr_t 、CString 、CTime这几个类型之间的转换问题，令人头疼。
今早上终于算是解决了CString和CTime的类型转换问题。
//CTime--〉CString
CTime t;
t=CTime::GetCurrentTime();
CString sur;
sur.Format("%s",t.Format("%Y-%m-%d"));
MessageBox(sur);
//long --> CString
long a ;
CString b;
b.format("%ld",a);
//double --->CString
double a;
CString b;
b.format("%f",a);
//CString--〉CTime
CString sur;
sur="2006-08-09";
COleDateTime time1;
time1.ParseDateTime(sur);
SYSTEMTIME systime;
VariantTimeToSystemTime(time1, &systime);
CTime tm(systime);
m_time=tm;
UpdateData(false);
CString和int，float之间的转换。
1。int <->CString
1) int ->CString
int n = 1;
CString str;
str.Format("%d",n);
2) CString->int
CString str = "1";
int n = atoi(str.GetBuffer(0));
2. char* 与CString
1)char*->CString
char sz[128];
CString str;
str.Format("%s",sz);
2) CString -> char*
CString str;
int nLength = str.GetLength();
char* sz = new char[nLength];
sz = str.GetBuffer(0);
3. float<->CString
1）float->CString
float f = 0.0;
CString str;
str.Format("%f",f);
2) CString->float
CString str = "0.0";
float f = atof(str.GetBuffer(0));
Format函数第一个参数是要转的那个数的类型
FileTime 和 CTime之间的转换问题
1. FileTime 转换成 CTime
方法(1)
FILETIME ft;
CTime time(ft);
方法(2)
FILETIME ft;
SYSTEMTIME st;
BOOL bSuccess=::FileTimeToSystemTime(&ft, &st)
if (bSuccess) //转换为SYSTEMTIME成功，下面转换成CTime
CTime time(st);
2. CTime 转换成 FileTime
CTime time(CTime::GetCurrentTime());
SYSTEMTIME st;
time.GetAsSystemTime(st);
FILETIME ft;
::SystemTimeToFileTime(&st, &ft);
