C + + lesson Tenth: standard C time and date functions

Source: Internet
Author: User
Tags local time time and date

Asctime ()

Time Text Format

Clock ()

Returns the elapsed time since the program started running

CTime ()

Return a specific format time

Difftime ()

The interval between two moments

Gmtime ()

Returns a pointer to the current GMT point

LocalTime ()

Returns a pointer to the current time

Mktime ()

Returns the calendar format for a specified time

Strftime ()

Returns a single element of a date and time

Time ()

Returns the current calendar time of the system

Asctime

Grammar:

#include <time.h>
Char *asctime (const struct TM *ptr);

Function: The function converts the time structure pointed to by PTR into the following string:

Day Month date Hours:minutes:seconds year\n\0

For example:

Mon June 26 12:03:53 2000

Related Topics:
LocalTime (), Gmtime (), Time (), and CTime ().

Clock

Syntax:

#include <time.h>
clock_t clock (void);

Function: The function returns the processor time since the program started running, and returns 1 if no information is available. The conversion return value is in seconds, and the return value is divided by Clocks_per_second. (Note: If the compiler is POSIX-compliant, Clocks_per_second is defined as 1000000.)

Related Topics:
Time (), Asctime (), and CTime ().

CTime

Syntax:

#include <time.h>
Char *ctime (const time_t *time);

Function: The function conversion parameter time is the local temporal format:

Day Month date Hours:minutes:seconds year\n\0

CTime () equivalent

Asctime (localtime (TP));

Related Topics:
LocalTime (), Gmtime (), Time (), and Asctime ().

Difftime

Syntax:

#include <time.h>
Double Difftime (time_t time2, time_t time1);

Function: The function returns the number of seconds that the difference between the time parameter time2 and time1 .

Related Topics:
LocalTime (), Gmtime (), Time (), and Asctime ().

Gmtime

Syntax:

#include <time.h>
struct TM *gmtime (const time_t *time);

Function: The function returns the given uniform world time (usually GMT) if the system does not support the unified world time system to return NULL. Warning!

Related Topics:
LocalTime (), Time (), and Asctime ().

LocalTime

Syntax:

#include <time.h>
struct TM *localtime (const time_t *time);

Function: The function returns the local calendar time. Warning!

Related Topics:
Gmtime (), Time (), and Asctime ().

Mktime

Syntax:

#include <time.h>
time_t mktime (struct TM *time);

Function: The function converts The local time of the type to the time of the calendar and returns the result. If an error occurs, return-1.

Related Topics:
Time (), Gmtime (), Asctime (), and CTime ().

Strftime

Syntax:

#include <time.h>
size_t strftime (char *str, size_t maxsize, const char *FMT, struct TM *time);

Function: The function formats the parameters of the time type as datetime information in the format set by the parameter FMT , and then stores it in the string str (up to maxsize characters). The code used to set the different types of time is:

Code

Meaning

%a

Abbreviated form of the week

%A

Full form of the week

%b

The abbreviated form of the month

%B

Full form of the month

%c

The abbreviated form of the month

%d

Day ordinal of the month (1-31)

%H

Hours, 24-hour format (0-23)

%I

Hours, 12-hour format (1-12)

%j

Day of the Year (1-366)

%m

Month (1-12). Note: Some versions of Microsoft Visual C + + may use a value range of 0-11.

%M

Minutes (0-59)

%p

Morning or afternoon in local time (AM or PM)

%s

Seconds (0-59)

%u

Week of the year, Sunday is the first day of the week

%w

Numeric representation of the Day of the week (0-6, Sunday =0)

%W

Week of the year, Sunday is the first day of the week

%x

Standard date string

%x

Standard Time string

%y

Year (0-99)

%Y

Year expressed in Ccyy (eg: 2004)

%Z

Time Zone Name

%%

Percent Sign

The function strftime () returns a value of the number of characters in the result string str , and returns zero if an error occurs.

Related Topics:
Time (), localtime (), and Gmtime ().

Time

Syntax:

#include <time.h>
time_t time (time_t *time);

Function: The function returns the current time if an error occurs and returns zero. If a parameter is given, the current time is stored in the parameter.

Related Topics:
LocalTime (), Gmtime (), strftime (), CTime (),

C + + lesson Tenth: standard C time and date functions

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