Convert a date into length of time

[jifonthespoon]

Given a Date object, convert it into a length of time ago from now. The length of time should be floored.

For example, a date from 2024-2-17 14:19:17 and today's date of 2024-2-20 13:45:54 would say "2d ago", but
2024-2-17 14:19:17 and today's date of 2024-2-20 16:45:54 would say "3d ago".

We'll do #min ago, #h ago, #d ago, #m ago, and #y ago.