Question

I need to add working hours to a timestamp. Working hours are from 8am to 6pm. Lets say we have 2pm and I have to add 6 hours. Result should be 10am… any guesses?

Thanks.

Answer 1

Try this bad boy.

You can specify whether to include weekends as working days, etc. Doesn’t take into account holidays.

<?php

function addWorkingHours($timestamp, $hoursToAdd, $skipWeekends = false)
{
    // Set constants
    $dayStart = 8;
    $dayEnd = 16;

    // For every hour to add
    for($i = 0; $i < $hoursToAdd; $i++)
    {
        // Add the hour
        $timestamp += 3600;

        // If the time is between 1800 and 0800
        if ((date('G', $timestamp) >= $dayEnd && date('i', $timestamp) >= 0 && date('s', $timestamp) > 0) || (date('G', $timestamp) < $dayStart))
        {
            // If on an evening
            if (date('G', $timestamp) >= $dayEnd)
            {
                // Skip to following morning at 08XX
                $timestamp += 3600 * ((24 - date('G', $timestamp)) + $dayStart);
            }
            // If on a morning
            else
            {
                // Skip forward to 08XX
                $timestamp += 3600 * ($dayStart - date('G', $timestamp));
            }
        }

        // If the time is on a weekend
        if ($skipWeekends && (date('N', $timestamp) == 6 || date('N', $timestamp) == 7))
        {
            // Skip to Monday
            $timestamp += 3600 * (24 * (8 - date('N', $timestamp)));
        }
    }

    // Return
    return $timestamp;
}

// Usage
$timestamp = time();
$timestamp = addWorkingHours($timestamp, 6);