Right now your Jira instance uses relative dates. If you are on Jira Server/Data Center then you can follow the following KB to switch your Jira to absolute dates:
But you will have absolute date in all Jira. Not only in comments.
Hi @Eran Polna
Check this doc from Atlassian about disabling relative dates:
If you want to change dates format you can go to: Administration - System - General configuration - Advanced settings.
Hope this helps
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