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<?php



function today_start()

{

    return mktime(0, 0, 0);

}



function today_end()

{

    return mktime(23, 59, 59);

}



function yesterday_start()

{

    $time = time();

    return mktime(0, 0, 0,

        date('n', $time), date('j', $time) - 1, date('Y', $time));

}



function yesterday_end()

{

    $time = time();

    return mktime(23, 59, 59,

        date('n', $time), date('j', $time) - 1, date('Y', $time));

}



function current_week_start($first_day_of_week = 1)

{

    $time = time();

    $weekday = date('w', $time);

    if ($first_day_of_week <= $weekday)

        $week_start_day = date('j', $time) - $weekday + $first_day_of_week;

    else

        $week_start_day = date('j', $time) - $weekday + $first_day_of_week - 7;

    return mktime(0, 0, 0,

        date('n', $time), $week_start_day, date('Y', $time));

}



function current_week_end($first_day_of_week = 1)

{

    $time = time();

    $weekday = date('w', $time);

    if ($first_day_of_week <= $weekday)

        $week_end_day = date('j', $time) - $weekday + $first_day_of_week + 6;

    else

        $week_end_day = date('j', $time) - $weekday + $first_day_of_week - 1;

    return mktime(23, 59, 59,

        date('n', $time), $week_end_day, date('Y', $time));

}



function previous_week_start($first_day_of_week = 1)

{

    $current_week_start = current_week_start($first_day_of_week);

    return $current_week_start - 7 * 24 * 60 * 60;

}



function previous_week_end($first_day_of_week = 1)

{

    $current_week_end = current_week_end($first_day_of_week);

    return $current_week_end - 7 * 24 * 60 * 60;

}



function current_month_start()

{

    $time = time();

    return mktime(0, 0, 0,

        date('n', $time), 1, date('Y', $time));

}



function current_month_end()

{

    $time = time();

    return mktime(23, 59, 59,

        date('n', $time) + 1, 0, date('Y', $time));

}



function previous_month_start()

{

    $time = time();

    return mktime(0, 0, 0,

        date('n', $time) - 1, 1, date('Y', $time));

}



function previous_month_end()

{

    $time = time();

    return mktime(23, 59, 59,

        date('n', $time), 0, date('Y', $time));

}



?>