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Concept
C date and time functions
Summary
The C date and time functions are a group of functions in the standard library of the C programming language implementing date and time manipulation operations. They provide support for time acquisition, conversion between date formats, and formatted output to strings.
The C date and time operations are defined in the time.h (ctime header in C++).
The and related types were originally proposed by Markus Kuhn to provide a variety of time bases, but only was accepted. The functionalities were, however, added to C++ in 2020 in std::chrono.
The following C source code prints the current time to the standard output stream.
#include
#include
#include
int main(void)
{
time_t current_time;
char* c_time_string;
/* Obtain current time. /
current_time = time(NULL);
if (current_time == ((time_t)-1))
{
(void) fprintf(stderr, "Failure to obtain the current time.\n");
exit(EXIT_FAILURE);
}
/ Convert to local time format. /
c_time_string = ctime(¤t_time);
if (c_time_string == NULL)
{
(void) fprintf(stderr, "Failure to convert the current time.\n");
exit(EXIT_FAILURE);
}
/ Print to stdout. ctime() has already added a terminating newline character.
Official source
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