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C Exercises: Print the current date and time

C Date Time: Exercise-1 with Solution

Write a program in C to print the current date and time.

Sample Solution:

C Code:

#include <time.h>
#include <stdio.h>  
#include <stdlib.h>

int main(void)
{
    time_t cur_time;
    char* cur_t_string;
    cur_time = time(NULL);
    if (cur_time == ((time_t)-1))
    {
        (void) fprintf(stderr, "Failure to get the current date and time.\n");
        exit(EXIT_FAILURE);
    }
    cur_t_string = ctime(&cur_time); //convert to local time format
    if (cur_t_string == NULL)
    {
        (void) fprintf(stderr, "Failure to convert the current date and time.\n");
        exit(EXIT_FAILURE);
    }
    (void) printf("\n The Current time is : %s \n", cur_t_string);
    exit(EXIT_SUCCESS);
}

Sample Output:

 The Current date and time is : Thu Aug 03 13:38:58 2017

N.B.: The result may vary for your current system date and time.

Flowchart:

Flowchart: Print the current date and time

C Programming Code Editor:

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C Programming: Tips of the Day

How I can print to stderr in C?

The syntax is almost the same as printf. With printf you give the string format and its contents i.e.:

printf("my %s has %d chars\n", "string format", 30);

With fprintf it is the same, except now you are also specifying the place to print to:

File *myFile;
...
fprintf( myFile, "my %s has %d chars\n", "string format", 30);

Or in your case:

fprintf( stderr, "my %s has %d chars\n", "string format", 30);

Ref : https://bit.ly/3v5U8Zq