Do we extend or get new cert after expiration?

[teksal]

Hello,
Sorry if this is a silly question, but it is the first time I make use of SSL certificates.
I successfully obtained and installed a certificate in DNS manual mode, which is going to expire in a week.
So how do I renew it?
1.) Do I just re-run acme.sh --renew ... and magically extend the expiry date of existing certificate?
2.) Or, do I get a new certificate via acme.sh --issue ..., edit TXT record in DNS and then run acme.sh --renew ...?

[Neilpang]

1.) Do I just re-run acme.sh --renew ... and magically extend the expiry date of existing certificate?

[teksal]

Hi,
I've run --renew , got new certificates, acme.sh --list displays the new dates, updated the TXT record in DNS, copied the new certs to web server folder and restarted the server, but the client browser still shows the old dates. What am I missing? My cert is from ZeroSSL