It didn’t say for December 2018 only. But I emailed them before I submitted my requirements to be sure. They confirmed the same.

It’s actually on their website. Refer to Stamp 4 Letter section.

https://dbei.gov.ie/en/What-We-Do/Workp ... t-updates/

I emailed DBEI and this was their response: Dear Sir/Madam I am directed by the Minister for Business, Enterprise and Innovation to refer to your correspondence regarding the employment permit issued to the above named. Thank you for your email querying the status of your Stamp 4 Support Letter. Ple...

I am a non EU citizen and I am currently processing my Stamp 4. My GNIB card expires on 3 December 2019. I started working in Ireland on 8 January 2018 but my work permit start date is 4 December 2017. I sent my application around August 2019 and DBEI received it on 6 August 2019. DBEI already proce...