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How to get the First and Last Day of every month in a given Year Using PHP

Ahsan Zameer
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In my recent project there was a requirement to display first day and last day of every month in a given year. So I had written a tiny but useful function in PHP to get array of month in a given year with their first and last day.

PHP
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<?php
function getFirstDayAndLastDay($year)
{
$currentYear = $year;
$currentYearArray = array();
for ($m=1; $m<=12; $m++)
{
$getMonthTimeStamp = mktime(0,0,0,$m, 1, $currentYear);
$month = date('F', $getMonthTimeStamp);
$monthAndYear = strtotime($month."-".$currentYear);
$currentYearArray[$month]['MonthStartDate'] = date('Y-m-01', $monthAndYear);
$currentYearArray[$month]['MonthEndDate'] = date('Y-m-t', $monthAndYear);
}
return $currentYearArray;
}
 
 
$firstAndLastDay = getFirstDayAndLastDay(2016);
echo "<pre>";
print_r($firstAndLastDay);
 
?>
 

In the above function I am using some PHP built-in date and time functions. Following they are with their description.

mktime(hour,minute,second,month,day,year): is used to find the day for that date and return it in Unix timestamp. This function takes 6 parameters.

date(format,timestamp): is used to format a date and/or a time.

strtotime(time,now): Convert text datetimes into Unix timestamps

Timestamp: is a current time of an event recorded by computer.


Above function takes numeric year (2016) as parameter. Then there is a for loop running 12 times (because there are 12 months in a year). $getMonthTimeStamp converts $m (month) into timestamp. Where $currentYear is a given year. $month converts month’s timestamp into month name. $monthAndYear takes $month and $currentYear as a date and convert them in a UNIX timestamp. $currentYearArray[$month][‘MonthStartDate’] and $currentYearArray[$month][‘MonthEndDate’] is an array key which hold first day and last day of months. Once loop runs 12 time it returns an array $currentYearArray holding first and last day every month.

PHP
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Array
(
    [January] => Array
        (
            [MonthStartDate] => 2016-01-01
            [MonthEndDate] => 2016-01-31
        )
 
    [February] => Array
        (
            [MonthStartDate] => 2016-02-01
            [MonthEndDate] => 2016-02-29
        )
 
    [March] => Array
        (
            [MonthStartDate] => 2016-03-01
            [MonthEndDate] => 2016-03-31
        )
 
    [April] => Array
        (
            [MonthStartDate] => 2016-04-01
            [MonthEndDate] => 2016-04-30
        )
 
    [May] => Array
        (
            [MonthStartDate] => 2016-05-01
            [MonthEndDate] => 2016-05-31
        )
 
    [June] => Array
        (
            [MonthStartDate] => 2016-06-01
            [MonthEndDate] => 2016-06-30
        )
 
    [July] => Array
        (
            [MonthStartDate] => 2016-07-01
            [MonthEndDate] => 2016-07-31
        )
 
    [August] => Array
        (
            [MonthStartDate] => 2016-08-01
            [MonthEndDate] => 2016-08-31
        )
 
    [September] => Array
        (
            [MonthStartDate] => 2016-09-01
            [MonthEndDate] => 2016-09-30
        )
 
    [October] => Array
        (
            [MonthStartDate] => 2016-10-01
            [MonthEndDate] => 2016-10-31
        )
 
    [November] => Array
        (
            [MonthStartDate] => 2016-11-01
            [MonthEndDate] => 2016-11-30
        )
 
    [December] => Array
        (
            [MonthStartDate] => 2016-12-01
            [MonthEndDate] => 2016-12-31
        )
 
)
 

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