Get first day date of the week on a given date PHP

Question

I have a date 2015-12-16

i want to get the date of the first day's date for the current week of my date

here 2015-12-16 is in the week 51 of the year then i want to get the first day's date of the week 51 ( 2015-12-14 here)

how could i do it ? thank you

EDIT: it must work when there are 53 weeks in the year (like in 2015 for example)

[Google would've done the trick](http://stackoverflow.com/questions/1897727/get-first-day-of-week-in-php) — Thoby, Apr 18 '17 at 14:06
Working code or not you should add it.. This is the point of SO rather than asking us to find you code or coding something up — Option, Apr 18 '17 at 14:09
@Option i won't post code which do absolutely not what i want it won't help someone, including you. If i post this thread it's because i already tried but didn't succeed — RomMer, Apr 18 '17 at 14:12
You've clearly missed the point of this place. With this being said I am leaving now, — Option, Apr 18 '17 at 14:15
Possible duplicate of [How to get the first day of a given week number in PHP (multi-platform)?](http://stackoverflow.com/questions/1659551/how-to-get-the-first-day-of-a-given-week-number-in-php-multi-platform) — Matt S, Apr 18 '17 at 19:40

apokryfos · Accepted Answer · 2017-04-18T14:48:10.970

3

You can do the following:

 $dateTime = new DateTime("2015-12-16");

 $weekNo = $dateTime->format("W");

 $newDate = new DateTime();
 $newDate->setISODate($dateTime->format("Y"), $weekNo);

Example:

http://sandbox.onlinephpfunctions.com/code/281a1ac298bfee8be421e333e4b7e92c6bb44d65

Since the above is a bit off in some cases here's something more reliable:

 $dateTime = new DateTime("2016-01-01");
 $dateTime->sub(new DateInterval("P".($dateTime->format("w")-1)."D"));  //Since the weekdays are 1-based.

Example: http://sandbox.onlinephpfunctions.com/code/c5cb0f077fa77974d977ddbffa6bc0b61f9d7851

edited Apr 18 '17 at 14:48

answered Apr 18 '17 at 14:09

apokryfos

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i'm testing it. Will keep you in touch – RomMer Apr 18 '17 at 14:12
@RomMer keep in mind that weeks start from Monday when using this code. – apokryfos Apr 18 '17 at 14:14
yes saw that but it's what i need i just have a last problem it works weird on 2016 the first 3 days of january 2016 are actually in the 53th week of 2015 how could i manage that ? – RomMer Apr 18 '17 at 14:21
i would like for these 3 days that the code gives me the beginning of the 53th week, then 2015-12-28 – RomMer Apr 18 '17 at 14:21
@RomMer try the second variation. – apokryfos Apr 18 '17 at 14:48

score 3 · Answer 2 · answered Apr 18 '17 at 19:38

3

$date = new \DateTime('2015-12-16');
echo $date->modify('last sunday +1 day')->format('Y-m-d');

This gets start of this week if you count monday to sunday.

answered Apr 18 '17 at 19:38

Marius Balčytis

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score 1 · Answer 3 · answered Sep 24 '20 at 23:51

1

Try this:

date('Y-m-d', strtotime('This week', strtotime('2015-12-16')));

answered Sep 24 '20 at 23:51

tim

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Get first day date of the week on a given date PHP

3 Answers3