Carbon: Is it a bug?

[yica00]

I test the time around 2018-3-29~2018-3-31:
$month = Carbon::now()->subMonth(1);
the result is 3, but it should be 2.why this? Thanks

[36864]

If today is 2018-03-29
SubMonth makes that 2018-02-29
2018 is not a leap year, so DateTime automatically corrects that to 2018-03-01

This is well-documented DateTime behavior that has existed for a very long time.

[sasureshkumar]

To fix this use:
$month = Carbon::now()->firstOfMonth()->subMonth();

[Glavic]

Or use Carbon::useMonthsOverflow(false);

Read more here: http://carbon.nesbot.com/docs/#api-addsub

[kylekatarnls]

Or $month = Carbon::now()->subMonthsNoOverflow(1);