Certificats update

Hi Community
In mars of this year, have an accident, aneurysm rupture, and I can’t stay focus very well, it’s too soon, and I’m afraid to do stupid things
I have problem with certificat root and intermediate
Valide à partir du : 2000-MAY-30
Valide jusqu’au : 2020-MAY-30
The date is expired and idon’t know how to fix this
I see this command on internet sudo update-ca-certificates but i’m not sure if it’s good ot not
I have buying certificat ssl and he is good
Please somebody can help me
server with Debian 8 with Seafile 7.0.5
Thank you