How to get this day last year in PHP?

Question

So I'm currently using Carbon for getting dates, times and comparisons. I can do subYear() easily enough to get this date last year. Now I need something to get the exact same day at the same time last year, e.g Wednesday of the second week of April.

I'd expect to have to do something that works out the current day of the week, e.g 3, and the current week of the year, then get the same value last year.

Just thought I'd check if there's anything available that already does this in Carbon or other PHP tools? Thanks

Cobbler

Look here https://mcmap.net/q/194262/-date-minus-1-year. May be, it is you want – Chest

Thanks splash but that would be the 'date' last year which I can already get using subYear() – Cobbler

You was looking there to more simpler way :) I've written it in my answer – Chest

There is a problem with the codes. Read my update to answer – Chest

Answer 1

I think DateTime::setISODate() is exactly what you need:

$today = new \DateTime();

$year  = (int) $today->format('Y');
$week  = (int) $today->format('W'); // Week of the year
$day   = (int) $today->format('w'); // Day of the week (0 = sunday)

$sameDayLastYear = new \DateTime();
$sameDayLastYear->setISODate($year - 1, $week, $day);

echo "Today: ".$today->format('Y-m-d (l, W)').PHP_EOL;
echo "Same week and day last year: ".$sameDayLastYear->format('Y-m-d (l, W)').PHP_EOL;

Output (for today, 2015-05-05):

Today: 2015-05-05 (Tuesday, 19)
Same week and day last year: 2014-05-06 (Tuesday, 19)

Sleek

Answer 2

For anyone else using Carbon you can do a similar solution to splash's and just have:

Carbon::now()->subWeeks(52)

gives 2014-05-07 14:11:48

Cobbler

bare in mind that some years have 53 weeks – Pelecypod

Answer 3

Make it easier :)

echo date('Y-m-d (l, W)', strtotime("-52 week"));

Edit: I forgot to write output: :)

2014-05-07 (Wednesday, 19)

UPDATE2:

There is a problem with jeromegamez' code. A year can contain 52 or 53 weeks. Taking 3 January of 2016:

$today = new \DateTime();
$today->setDate ( 2016 , 1 , 3 );

$year  = (int) $today->format('Y');
$week  = (int) $today->format('W'); // Week of the year
$day   = (int) $today->format('w'); // Day of the week (0 = sunday)

$sameDayLastYear = new \DateTime();
$sameDayLastYear->setISODate($year - 1, $week, $day);

echo "Today: ".$today->format('Y-m-d (l, W)').PHP_EOL;
echo "Same week and day last year: ".$sameDayLastYear->format('Y-m-d (l, W)').PHP_EOL;

result is:

Today: 2016-01-03 (Sunday, 53) 
Same week and day last year: 2015-12-27 (Sunday, 52)

only five days instead of years :)

Chest

Yes I've been looking into this and trying to decide whether we want to let the date value to move on longer years so will see – Cobbler

It not so far as you think. Set date $today->setDate ( 2016 , 1 , 3 ); You receive Today: 2016-01-03 (Sunday, 53) Same week and day last year: 2015-12-27 (Sunday, 52). only five days instead of years :) – Chest

Look 52 weeks back seems better :) – Chest

Answer 4

Something even easier <3

date('Y-m-d', strtotime('last year'))

Barge