C + + Get system Current time

#include

* Method One

time_t TT = time (NULL);/This sentence returns just a moment CuO

tm* t= localtime (&TT);

printf ("%d-%02d-%02d%02d:%02d:%02dn",

T->tm_year + 1900,

T->tm_mon + 1,

T->tm_mday,

T->tm_hour,

T->tm_min,

T->TM_SEC);

* Method II

SYSTEMTIME st = {0};

Getlocaltime (&ST);

printf ("%d-%02d-%02d%02d:%02d:%02dn",

St.wyear,

St.wmonth,

St.wday,

St.whour,

St.wminute,

St.wsecond);

The following several, is the online search: Reprint address: http://apps.hi.baidu.com/share/detail/17815869

Personally feel that the second is more practical, but also the most commonly used ~

However, when the calculation algorithm time is time-consuming, do not forget second, can not only use milliseconds to reduce, otherwise negative, if the algorithm takes too long to use the minutes. Otherwise, hours ...

Scenario-Benefits: Only use C standard library; Disadvantage: only accurate to second level

#include

#include

int main (void)

{

time_t t = time (0);

Char tmp[64];

Strftime (TMP, sizeof (TMP), "%y/%m/%d%x%A%j Days of the Year",%z (localtime));

Puts (TMP);

return 0;

}

size_t strftime (char *strdest, size_t maxsize, const char *format, const struct TM *timeptr);

Generates a string from a format string.

struct TM *localtime (const time_t *timer);

Obtain local time, the results obtained by the localtime are returned by the structure TM

The returned string can be determined in the following format:

%a the abbreviation of the week. Eg:tue

%A the full name of the week. Eg:tuesday

The abbreviation for the%b month name.

The full name of the%B month name.

%c Local End Date time is a better representation string.

%d numbers indicate the day of the month (range 00 to 31). Date

%H uses a 24-hour system number to indicate the number of hours (range 00 to 23).

%I A 12-hour number is used to indicate the number of hours (ranging from 01 to 12).

%j the number of days of the year (ranging from 001 to 366).

Number of%m months (ranging from 1 to 12).

%m minutes.

%p indicates the local end time with ' AM ' or ' PM '.

%s Number of seconds.

The%u number is expressed as the week ordinal of the year, and the first one week begins in Sunday.

The%w number is expressed as the week ordinal of the year, and the first one week begins in Monday.

%w the number of days of the week (0 for Sunday).

%x does not contain a date representation of time.

%x does not contain a time representation of dates. Eg:15:26:30

%y two digits indicates the year (range from 00 to 99).

%Y full year digits, that is, four digits. eg:2008

%Z (%Z) time zone or name abbreviation. EG: China Standard Time

%%% character.

Scheme Two advantages: can be accurate to the millisecond; disadvantage: Using Windows API

#include

#include

int main (void)

{

SYSTEMTIME SYS;

Getlocaltime (&sys);

printf ("%4d/%02d/%02d%02d:%02d:%02d.%0 3d Week%1DN ", Sys.wyear,sys.wmonth,sys.wday,sys.whour,sys.wminute, Sys.wsecond,sys.wmilliseconds,sys.wdayofweek);

return 0;

}

Scheme III, advantages: the use of system functions, but also to modify the system time

This file must be a C + + file

#include

#include

using namespace Std;

void Main ()

{

System ("Time");

}

Scenario four, the current time is converted to a second level, and then the corresponding time conversion can be

This file must be a C + + file

#include

#include

using namespace Std;

int main ()

{

time_t Now_time;

Now_time = time (NULL);

cout<

return 0;

}

Note: There is a difference between getlocaltime () and GetSystemTime ().