VC ++ obtains the system time and program running time (precise to seconds and milliseconds ).

VC ++ obtains the system time and program running time (precise to seconds and milliseconds ).

1. Use the CTime class (get the current system time, accurate to seconds)
CString str; // obtain the system time CTime tm; tm = CTime: GetCurrentTime (); // obtain the system date str = tm. format ("the current time is % Y % m month % d % X"); MessageBox (str, NULL, MB_ OK );
A. Extract year, month, day, hour, minute, and second from CTimet.
CTime t = CTime: GetCurrentTime (); int d = t. getDay (); // get the number int y = t. getYear (); // get the year int m = t. getMonth (); // get the int h = t of the current month. getHour (); // get the current time int mm = t. getMinute (); // get the minute int s = t. getSecond (); // get the second int w = t. getDayOfWeek (); // obtain the day of the week. Note that 1 is Sunday and 7 is Saturday.
B. The CTimeSpan class can be used to calculate the difference between the two periods. The usage is as follows:
CTime t1 (1999, 3, 19, 22, 15, 0); CTime t = CTime: GetCurrentTime (); CTimeSpan span = t-t1; // calculate the interval between the current system time and time t1. int iDay = span. getDays (); // obtain the total number of days of the interval. int iHour = span. getTotalHours (); // get the total number of hours int iMin = span. getTotalMinutes (); // obtain the total number of minutes int iSec = span. getTotalSeconds (); // get the total number of seconds
C. Obtain the current date and time and convert it to CString.
CTime tm = CTime: GetCurrentTime (); CString str = tm. Format ("% Y-% m-% d"); // display year, month, and day
2. Use the GetLocalTime: Windows API function to obtain the current local system date and time (accurate to milliseconds). This function stores the obtained system time information in the SYSTEMTIME struct.
Typedef struct _ SYSTEMTIME {WORD wYear; // year WORD wMonth; // month WORD wDayOfWeek; // week: 0 is Sunday, 1 is Monday, 2 is Tuesday ...... WORD wDay; // day WORD wHour; // hour WORD wMinute; // minute WORD wSecond; // Second WORD wMilliseconds; // millisecond} SYSTEMTIME, * PSYSTEMTIME;
Example:
SYSTEMTIME st;CString strDate,strTime;GetLocalTime(&st);strDate.Format("%4d-%2d-%2d",st.wYear,st.wMonth,st.wDay);strTime.Format("%2d:%2d:%2d",st.wHour,st.wMinute,st.wSecond) ;AfxMessageBox(strDate);AfxMessageBox(strTime);
3. Use GetTickCount: the number of milliseconds that have elapsed since the operating system was started (elapsed). The returned value is DWORD. (Precise to milliseconds)
// Get the program running time long t1 = GetTickCount (); // get the system running time before the program segment starts (MS) Sleep (500); long t2 = GetTickCount ();(); // get the system Runtime (MS) str after the program segment ends. format ("time: % dms", t2-t1); // The difference between front and back is the running time AfxMessageBox (str); // get the system running time long t = GetTickCount (); CString str, str1; str1.Format ("when the system is running % d", t/3600000); str = str1; t % = 3600000; str1.Format ("% d ", t/60000); str + = str1; t % = 60000; str1.Format ("% d seconds", t/1000); str + = str1; AfxMessageBox (str );
4. use time_t time (time_t * timer): only use the C Standard Library (accurate to seconds) to get the time difference in seconds from the standard time point (usually midnight on January 1, January 1, 1970) to the current time: double difftime (time_t timer1, time_t timer0) struct tm * localtime (const time_t * timer); get local time, the result obtained by localtime is returned by the structure tm. The returned string can be in the following format: % a abbreviation of the day of the week. Eg: Full name of Tue % A day of the week. Eg: Abbreviation of Tuesday % B month name. % B full name of the month name. % C the local date time is better than the string. % D indicates the day of the month (range: 00 to 31) with a number ). The date % H represents the hour in the 24-hour format (range: 00 to 23 ). % I represents the hour in 12-hour format (range: 01 to 12 ). % J indicates the day of the year (range: 001 to 366 ). The number of % m months (ranging from 1 to 12 ). % M minutes. % P uses ''am'' or ''pm ''to indicate the local time. % S seconds. % U indicates the week of the current year. The first week starts from the first Sunday. % W indicates the week of the current year. The first week starts from the first Monday. % W indicates the day of the week by number (0 indicates Sunday ). % X date representation without time. % X does not include the time representation of the date. Eg: 15:26:30% y two digits indicate the year (range: 00 to 99 ). % Y indicates the complete year number, that is, the four-digit number. Eg: 2008% Z (% z) Time Zone or abbreviation. Eg: Chinese Standard Time % characters. Including: year, month, day, week, hour, minute, second, millisecond. [Drinking wine] http://blog.const.net.cn/a/16370.htm