greetings everyone

I'm developing a web site with blog session in K2 extension for Joomla.

When I creates the first Article/Post of the day (on frontend), it's date appear like "29/11/-0001".

For fix this, I have to login on administrator (backend) to alter creates and publication dates.

From the second Item onwards all works fine...

My system date/time is correct on joomla settings.

Nothing relevant is showed with debug mode activated.

Anybody can help me ?

Versions:

Joomla 3.7.3

K2 plugin 2.7.1

Ty