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C Exercises: Print the date and time before 24 months

C Date Time: Exercise-8 with Solution

Write a program in C to print the date and time before 24 months.

Sample Solution:

C Code:

#define _POSIX_C_SOURCE 200112L 
#include <stdlib.h>
#include <stdio.h>
#include <time.h>
 
int main(void)
{
    setenv("TZ", "/usr/share/zoneinfo/Asia/Calcutta", 1);   
    struct tm tm = *localtime(&(time_t){time(NULL)});
    printf("\nToday is :          %s", asctime(&tm));
    printf("(DST is %s)\n", tm.tm_isdst ? "in effect" : "not in effect");
    tm.tm_mon -= 24;  
    mktime(&tm);       
    printf("\n24 months ago the date was : %s", asctime(&tm));
    printf("(DST was %s)\n\n", tm.tm_isdst ? "in effect" : "not in effect");
}

Sample Output: 

Today is :          Thu Aug  3 17:27:16 2017                                                                                  
(DST is not in effect)                                                                                                        
                                                                                                                              
24 months ago the date was : Mon Aug  3 17:27:16 2015                                                                         
(DST was not in effect)

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

Flowchart:

Flowchart: Print the date and time before 24 months

C Programming Code Editor:

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Next: Write a program in C to show the first of calendar time.

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C Programming: Tips of the Day

Static variable inside of a function in C

The scope of variable is where the variable name can be seen. Here, x is visible only inside function foo().

The lifetime of a variable is the period over which it exists. If x were defined without the keyword static, the lifetime would be from the entry into foo() to the return from foo(); so it would be re-initialized to 5 on every call.

The keyword static acts to extend the lifetime of a variable to the lifetime of the programme; e.g. initialization occurs once and once only and then the variable retains its value - whatever it has come to be - over all future calls to foo().

Ref : https://bit.ly/3fOq7XP