Quite often the logic of our applications rely on the current time. For example, if it's weekend, or if it's past midday or something. We usually use Carbon::now() to check the time - but what if it's morning now, and we need to test if it's 5 PM already? Do we really need to wait till evening to test the function? No. Carbon has a trick for that.
There's a function called Carbon::setTestNow() where you can set the parameter of whatever you want. Examples:
$knownDate = Carbon::create(2001, 5, 21, 12);
Carbon::setTestNow($knownDate);
echo Carbon::now(); // will show 2001-05-21 12:00:00
What it does is "faking" now() time, allowing you to test the functionality with real-time, without waiting.
If you want to clear "fake" time, just call same function without parameters:
Carbon::setTestNow();
Also you can test, if there's "fake" time set:
if (Carbon::hasTestNow()) { // ...
Also, remember that Carbon can parse data in a lot of formats, like this:
Carbon::setTestNow(Carbon::parse('first day of March 2015'));
In general, I recommend that you read through Carbon documentation - there's a lot of "hidden gems" and useful functions.
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