C Exercises: Convert a tm object to custom wide string textual representation

Last update on March 20 2025 12:31:53 (UTC/GMT +8 hours)

5. tm Object to Wide String

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

Sample Solution:

C Code:

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

int main(void) {
    wchar_t buff[40]; // Wide character array to store the formatted date and 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 = 17,  // = 17 hours
        .tm_min = 51,   // = 51 minutes
        .tm_sec = 10    // = 10 seconds
    };

    printf("\n The textual representation of specified date and time :\n");
    // Format the time structure to a wide character string based on the provided format specifier
    if (wcsftime(buff, sizeof buff, L"%A %c", &mytime)) {
        printf("\n%ls\n", buff); // Print the formatted date and time string using wide character format
    } else {
        puts("wcsftime failed"); // Print a message if wcsftime fails
    }

    setlocale(LC_ALL, "en_US.UTF-8"); // Change the locale to English (US) in UTF-8 encoding
    if (wcsftime(buff, sizeof buff, L"%A %c", &mytime)) {
        printf("%ls\n\n", buff); // Print the formatted date and time string in the specified locale
    } else {
        puts("wcsftime failed"); // Print a message if wcsftime fails after changing the locale
    }

    return 0;
}

Output:

 The textual representation of specified date and time :

Sunday 09/02/16 17:51:10
Sunday 09/02/16 17:51:10

Flowchart:

For more Practice: Solve these Related Problems:

• Write a C program to convert a tm structure into a wide string using swprintf() with a custom date-time format.
• Write a C program to generate a wide string representation of a tm object that includes the full weekday and month names.
• Write a C program to output a tm object as a wide string in the format "Weekday DD/MM/YY HH:MM:SS".
• Write a C program to create a wide string from a tm object using locale-specific formatting settings.

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