setTime Carbon also affexts other variable-CodePudding

I have Carbon Object Date which I change the time for a start_date and end_date, what happens is it both becomes the same thing even though I saved it on a seperate variable.

Input

    $this->temp_mon_start = $date->setTime(8,0);
    $this->temp_mon_end = $date->setTime(3,0);  
    dd($this->temp_mon_start, $this->temp_mon_end);

Output

   date: 2021-11-15 03:00:00.0 Asia/Singapore ( 08:00)
   date: 2021-11-15 03:00:00.0 Asia/Singapore ( 08:00)

It appears it saves the last setTime on the $date variable, which I don't know what is causing the issue. I'm using Laravel and Carbon. Is there any possible alternative on this? Appreciate the help.

CodePudding user response：

Well Carbon works that way. It does not create a new instance but rather changes existing one.

So insted of using:

$this->temp_mon_start = $date->setTime(8,0);

you can use:

$this->temp_mon_start = $date->copy()->setTime(8,0);

copy() method creates new instance of Carbon object.