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:

C Programming Code Editor:
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Previous: Write a program in C to convert a time_t object to calendar time expressed as local time.
Next: Write a program in C to show the first of calendar time.
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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
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