PHP First day of month using DateTime

Question

I have a datetime in php:

$datetime=new DateTime();

How can I get day of week:

$datetime->format("w");

But for first day of current $datetime month?

just use this single line code `echo date("l",strtotime('first day of this month'));` `///sunday` — Manjeet Barnala, May 05 '16 at 05:34
Possible duplicate of [The first day of the current month in php using date\_modify as DateTime object](http://stackoverflow.com/questions/2094797/the-first-day-of-the-current-month-in-php-using-date-modify-as-datetime-object) — user3942918, May 05 '16 at 06:06

Kevin · Accepted Answer · 2016-05-05T04:37:50.563

8

Just use the ->modify() method to adjust accordingly:

$datetime = new DateTime();
$datetime->modify('first day of this month');
$output = $datetime->format("w");
echo $output; // 0 - sunday

Without the relative date time string:

$dt = new DateTime();
$dt->setDate($dt->format('Y'), $dt->format('m'), 1);
$output = $dt->format('w');
echo $output;

edited May 05 '16 at 04:37

answered May 05 '16 at 04:28

Kevin

1

Or pass the relative date/time format string to the DateTime constructor rather than modify it afterward. – user3942918 May 05 '16 at 04:35
@PaulCrovella yeah i forgot they share the same parsing with `strtotime` – Kevin May 05 '16 at 04:40

Murad Hasan · Answer 2 · 2016-05-05T04:39:44.137

0

You can try with this:

Requires PHP 5.3 to work ("first day of" is introduced in PHP 5.3).

Otherwise the example above is the only way to do it:

l = A full textual representation of the day of the week

$datetime = new DateTime();
$datetime->modify('first day of this month');
echo $output = $datetime->format("l"); //Sunday

Alternative:

echo date("l", strtotime(date('Y-m-01'))); //Sunday

edited May 05 '16 at 04:39

answered May 05 '16 at 04:32

Murad Hasan

2 Answers2