how to get relative date from absolute date ? in shell

Question

Consider dates of the format:

• 2022-06-18T11:03:40+0800
• 1655107420 ...

How could you get dates with relative information (i.e the time delta N minutes ago):

Saturday, June 18, 2022 at 11:32:30 (3 minutes ago)
Saturday, June 18, 2022 at 11:19:03 (17 minutes ago)