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Add Print DateTime Represented By Unix Timestamp as a Unix TIL

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# Print DateTime Represented By Unix Timestamp
A lot of tools and systems use a Unix timestamp to represent a point in time.
It is the number of seconds since the Unix epoch (Jan 1, 1970). However, just
looking at a timestamp like `1623867544` doesn't tell a human much. I can't
mentally translate that to the date and time that it is representing.
The `date` utility can help. Give it the `-r` flag with the timestamp value (in
seconds) and it will display the date and time in a human-readable format.
```bash
❯ date -r '1623867544'
Wed Jun 16 13:19:04 CDT 2021
```
See `man date` for more details.