oc-calendars error Gregorian date

[happyprogrammer2020]

Hello, thanks for publishing this plugin
There is a problem next intall 3 required plugin october fa, when creating the post on the rain lab blog it gives the following error:
"Uncaught Invalid Gregorian date"

[happyprogrammer2020]

Is there any answare for me ?

[jafarpishdadi]

Hello,
when creating the post on the rain lab blog it gives the following error:
"Uncaught Invalid Gregorian date"