C Exercises: Convert a tm object to custom textual representation

Last update on March 20 2025 12:31:54 (UTC/GMT +8 hours)

4. tm Object Custom Text Format

Write a program in C to convert a tm object to a custom textual representation.

Sample Solution:

C Code:

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

int main(void) {
    char time_buff[70]; // Buffer to store the formatted time string
    // Create a custom time structure with specified date and time
    struct tm mytime = {
        .tm_year = 116, // = year 2016 (years since 1900)
        .tm_mon = 8,    // = 9th month (0-based index)
        .tm_mday = 2,   // = 2nd day of the month
        .tm_hour = 16,  // = 16 hours
        .tm_min = 30,   // = 30 minutes
        .tm_sec = 32    // = 32 seconds
    };

    printf("\n The textual representation of specified date and time :\n"); 

    // Convert the time structure to a formatted string according to the locale settings
    if (strftime(time_buff, sizeof time_buff, "%B %c %P", &mytime)) {
        puts(time_buff); // Print the formatted time string
    } else {
        puts("strftime failed"); // Print a message if strftime fails
    }

    // Change the locale to Greek (el_GR.utf8)
    setlocale(LC_TIME, "el_GR.utf8");

    // Format the time again after changing the locale
    if (strftime(time_buff, sizeof time_buff, "%B %c %P", &mytime)) {
        puts(time_buff); // Print the formatted time string in the Greek locale
    } else {
        puts("strftime failed"); // Print a message if strftime fails after changing the locale
    }

    printf("\n");
    return 0;
}

Output:

 The textual representation of specified date and time :                                                                      
September Sun Sep  2 16:30:32 2016 pm                                                                                         
September Sun Sep  2 16:30:32 2016 pm 

Flowchart:

For more Practice: Solve these Related Problems:

• Write a C program to convert a tm structure into a custom string format like "Weekday, Month Day, Year - HH:MM:SS".
• Write a C program that takes user-specified format parameters and outputs the tm object accordingly.
• Write a C program to convert a tm object into a string that includes an AM/PM indicator based on the hour.
• Write a C program to output a tm object as a string that appends a custom ordinal suffix (e.g., 1st, 2nd) to the day.

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