Mar. 8 2011

Get the last day of the month

Just ran into an issue where I needed to know the last day of the month in PHP. Sure enough, there’s a way.

date('Y-m-d',strtotime('+1 month',strtotime(date('m').'/01/'.date('Y').' 00:00:00'))-1);

That line will output something like 2011-03-31.

If you need just the Unix timestamp, you can just remove the date function. It’ll output something like 1301633999, which is 2011-03-01 23:59:59 GMT.

strtotime('-1 second',strtotime('+1 month',strtotime(date('m').'/01/'.date('Y').' 00:00:00')));

The way it works goes a little something like this:

  1. Gets the Unix timestamp for the first day of the current month.
  2. Adds a month–giving you the first day of the next month–and returns the timestamp.
  3. Subtracts one second from that time giving you the last second of the last day of the current month.

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Dedicated to my mom, Sharon. May she rest peacefully.
Love you always. (March 23, 1965 - November 12, 2011)

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