Time and Date in C++

C++ Time and Date:
The C++ standard library does not provide a proper date type. C++ inherits the structs and
functions for date and time manipulation from C. To access date and time related functions and
structures, you would need to include <ctime> header file in your C++ program.
There are four time-related types: clock_t, time_t, size_t, and tm. The types - clock_t, size_t and
time_t are capable of representing the system time and date as some sort of integer.
The structure type tm holds the date and time in the form of a C structure having the following
elements.

For example:
struct tm {

int tm_sec; // seconds of minutes from 0 to 61

int tm_min; // minutes of hour from 0 to 59

int tm_hour; // hours of day from 0 to 24

int tm_mday; // day of month from 1 to 31

int tm_mon; // month of year from 0 to 11

int tm_year; // year since 1900

int tm_wday; // days since sunday

int tm_yday; // days since January 1st

int tm_isdst; // hours of daylight savings time

}

Following are the important functions, which we use while working with date and time in C or
C++. All these functions are part of standard C and C++ library and you can check their detail
using reference to C++ standard library given below.

time_t time(time_t *time);

This returns the current calendar time of the system in number of seconds elapsed since January
1, 1970. If the system has no time, .1 is returned.

char *ctime(const time_t *time);

This returns a pointer to a string of the form day month year hours:minutes:seconds year\n\0.