PHP Carbon每月第n天

Question

January 19, 2018 is the third Friday of the month.

I want the number 3 denoting that this is the third Friday. Can Carbon do this?

Further, I'll then be using that to check to see if another date is before or after the third Friday of another month. For instance, is February 17, 2018 before or after the third Friday in February?

Answer 1

Carbon is a layer on top of the PHP class DateTime , which is very powerful as it supports many formats that are outlined here , specifically you're looking for the Relative Formats .

Third friday of february is a valid Relative Format, therefore, you can do something like this:

Carbon::parse('February 17th') > Carbon::parse('third friday of february');

And that will produce true , whereas:

Carbon::parse('February 15th') > Carbon::parse('third friday of february');

Will produce false .

You need to be mindful that formatting is very important when constructing this way, for example, third friday in february is not valid.

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I don't believe that there's any functionality within the DateTime class that would allow for the first part in a single DateTime format, however, you can use something like this:

1. Determine the day of the provided date
2. Find the first of that day in the month
3. Compare (number of days / 7) between your date and the first day

eg:

$date = Carbon\Carbon::parse('January 18 2018');

$firstDay = Carbon\Carbon::parse("first {$date->format('l')} of {$date->format('F')}");
$nth = $firstDay->diffInDays($date) / 7 + 1;

echo "{$date->format('Y-m-d')} is the #{$nth} {$date->format('l')} in this month";

Answer 2

Apparently it can.

Edit: Ignore this

I don't think Carbon can do exactly what you're asking directly, but doing some calculations using the builtin getters I'm sure you could achieve this quiet easily.

http://carbon.nesbot.com/docs/#api-getters

Start with parsing the date:

$dt = Carbon::parse('2018-19-1 23:26:11.123789');

Then use weekOfMonth , dayOfMonth , dayOfWeek , etc.