Getting first day of a given month in PHP?

Question

I've been trying to get the code below to work, and while it worked with June it is not working with July.

The below results in a value of 3 for $first_day_of_month when it should be 2 for Tuesday.

$date = strtotime('20140702'); // July 02, 2014
$month = date('m',$date);
$year = date('Y',$date);
$days_in_month = date('t',$date);
$first_day_of_month = date('w', strtotime($year . $month . 01)); // sunday = 0, saturday = 6

May want to remove the line "$days_in_month = date('t',$date);" since it's not related to your question. — Sven Tore, Jun 23 '14 at 19:40

score 5 · Accepted Answer · answered Jun 23 '14 at 19:29

5

The strtotime function supports relative time formats. You can just do this instead:

$date = strtotime('20140702');
$first_date = strtotime('first day of this month', $date);
$first_day_of_month = date('w', $first_date);

The second parameter to strtotime provides the time that the relative format will be relative to. You can use this to easily calculate dates relative to a particular point, as shown above.

answered Jun 23 '14 at 19:29

Alexis King

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I have a format like `mm.YYY`,eg:`07.2017` and i need to find first and last date of this month-year.Please Consider this problem -@Alexis King – ubm Oct 25 '17 at 08:11

score 2 · Answer 2 · answered Jun 23 '14 at 19:32

2

You would have to cast 01 to a string or else php will compute the time for 2014071 rather 20140701

strtotime($year . $month . '01')

answered Jun 23 '14 at 19:32

Jason

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score 2 · Answer 3 · answered Jun 23 '14 at 19:38

You should look at mktime().

In your case your best approach would be:

$date = strtotime('20140702'); // July 02, 2014
$month = date('m',$date);
$year = date('Y',$date);
$days_in_month = date('t',$date);


$first_day_of_month = date('w', mktime(0,0,0,$month,1,$year)); // sunday = 0, saturday = 6

As a bonus you can also get the last day of the month

$last_date_of_month = mktime(0,0,0,$month+1,0,$year);

Getting first day of a given month in PHP?

3 Answers3