Month by week of the year?

Question

I\'m trying to get the number of the month of the year by the number of a week of the year and the year. So for example week 1 is in january and returns 1, week 6 is in february

Answer 1

Using PHP DateTime objects (which is the preferred way of dealing with dates see links below for more info) you can accomplish it this way:

$dateTime = new \DateTime();
$dateTime->setISODate($year,$week);
$month = $dateTime->format('n');

Note that the following will not work as week "W" is not a supported format:

$month = \DateTime::createFromFormat("W/Y ", "1/2015")->format('n');

The format used by this method is the same supported by the function you where trying to use date_parse_from_format, hence the errors.

• Why PHP DateTime Rocks
• DateTime class vs. native PHP date-functions
• strtotime notes
• PHP/Architect's Guide to Date and Time Programming (Chapter 2)