PHP Exercises: Reads a date and prints the day of the date

Last update on May 27 2025 13:09:25 (UTC/GMT +8 hours)

59. Find Day of the Date in 2016

Write a PHP program to that reads a date (from 2004/1/1 to 2004/12/31) and prints the day of the date. Jan. 1, 2004, is Friday. Note that 2004 is a leap year.
Two integers m and d separated by a single space in a line, m ,d represent the month and the day.

Input:Input numbers (real numbers) are separated by a space.
Input 0 to exit.

Visual Presentation:

PHP: Reads a date and prints the day of the date.

Sample Solution:

PHP Code:

<?php
// Define an array of days in a non-leap year
$days = explode(',', '0,31,60,91,121,152,182,213,244,274,305,335');
// Define an array of corresponding day names
$format = explode(',', 'Wednesday,Thursday,Friday,Saturday,Sunday,Monday,Tuesday');

// Continue reading lines from standard input until an empty line is encountered
while (($line = trim(fgets(STDIN))) !== '') {
    // Extract month and day values from the input line
    sscanf($line, '%d %d', $m, $d);

    // Check if the month is 0, which indicates the end of input
    if ($m === 0) {
        break;
    }

    // Calculate the day of the year using the pre-defined array
    $n = $days[$m - 1] + $d;

    // Determine the day of the week using the pre-defined array of day names
    $today = $format[$n % 7];

    // Output the result
    echo "The day is: " . $today, PHP_EOL;
}
?>

Explanation:

Define Days Array:

An array named $days is defined using explode(), representing the cumulative number of days at the end of each month in a non-leap year.

The values are:

January: 0
February: 31
March: 60
April: 91
May: 121
June: 152
July: 182
August: 213
September: 244
October: 274
November: 305
December: 335

Define Day Names Array:

An array named $format is defined, which contains the names of the days of the week, starting from Wednesday.

Read Input Until Empty Line:

A while loop continues to read lines from standard input until an empty line is encountered.

Extract Month and Day:

The input line is parsed using sscanf() to extract the month ($m) and day ($d) values.

Check for End of Input:

If the month is 0, the loop breaks, indicating the end of input.

Calculate Day of the Year:

The day of the year ($n) is calculated by adding the cumulative days of the month (from the $days array) to the day of the month ($d).

Determine Day of the Week:

The day of the week is determined by taking the modulus of $n with 7 and using it to index into the $format array.

Output the Result:

The program outputs the day of the week corresponding to the given month and day.

Sample Input:
9 15

Sample Output:

The day is: Thursday

Flowchart:

For more Practice: Solve these Related Problems:

Write a PHP script to compute the weekday for any given date in 2016 using Zeller’s congruence.
Write a PHP function to determine the day of the week for a date in a leap year and output the day name.
Write a PHP script to compare computed weekdays with a preset 2016 calendar for verification.
Write a PHP script to validate a 2016 date input and output the corresponding day of the week accurately.

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PHP Code Editor:

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