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Darren Schroeder 29eb109b1e try to fix datetime-diff for ms, us, ns (#15537) ...

# Description

This PR tries to fix the datetime-diff custom command so that it
includes ms, us, ns.

Difference in the banner in 2 separate starts.

### Old
```nushell
It's been this long since Nushell's first commit:
5yrs 10months 29days 9hrs 1min 47secs
```

### New
```nushell
It's been this long since Nushell's first commit:
5yrs 10months 29days 9hrs 1min 22secs 49ms 885µs
```

There should be ns above on the new one, not sure why there isn't. It
could have something to do with how the banner works but i'll save that
for another PR.

🤔 It could be because there are no fractional seconds in the math?
`datetime-diff (date now) 2019-05-10T09:59:12-07:00`. However, I'm not
sure why `date now` has no nanoseconds. Oh, wait. I think that's because
MacOS doesn't have nanosecond precision?
```
❯ ^date +%s.%N
1744251636.365003000
```

Closes https://github.com/nushell/nushell/issues/15524

/cc @NotTheDr01ds 

# User-Facing Changes
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2025-04-10 06:52:11 -05:00

..

mod.nu

try to fix datetime-diff for ms, us, ns (#15537)

2025-04-10 06:52:11 -05:00