Is there a feature or plugin to add a timestamp in a JIRA comment?

[Sean Maher]

I'd love to be able to add a timestamp to a comment that will be displayed in the user's local time zone when they view the comment. 

I can enter text like "image updated at 7am" but that won't respect the user's local time zone, which is awkward for remote teams. 

[Randy]

No there is not but why not just agree to either include timezone when calling out times or agree that all times mentioned without a timezone will be assumed to be in a specific timezone?  I imagine you'd have to establish this working agreement for your geographically distributed team anyways as you would be talking times in conversations and other channels outside of jira.