Write a function to display a past or future date & time in a human-friendly way, for example:
- if less than 1 hour away: " 43 minutes ago" or "in 43 minutes"
- if within the same day: "3 hours ago at [time]" or "in 3 hours at [time]"
- if within the previous or next day: "yesterday at [time]" or "tomorrow at [time]"
- if more than 1 day apart: "3 days ago at [time]" or "in " days at [time]"
- special case for a future date more than 6 hours and less than 2 days away: "this afternoon at [time]" or "this evening at [time]" or "tomorrow morning at [time]", "tomorrow afternoon at [time]", etc.
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