support datetimes

[codecov[bot]]

Codecov Report

All modified lines are covered by tests :white_check_mark:

Comparison is base (d397fef) 100.00% compared to head (50cfd22) 100.00%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #38 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 5 6 +1 Lines 121 129 +8 ========================================= + Hits 121 129 +8 ``` | [Files](https://app.codecov.io/gh/JuliaMath/InverseFunctions.jl/pull/38?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaMath) | Coverage Δ | | |---|---|---| | [ext/DatesExt.jl](https://app.codecov.io/gh/JuliaMath/InverseFunctions.jl/pull/38?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaMath#diff-ZXh0L0RhdGVzRXh0Lmps) | `100.00% <100.00%> (ø)` | | | [src/InverseFunctions.jl](https://app.codecov.io/gh/JuliaMath/InverseFunctions.jl/pull/38?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaMath#diff-c3JjL0ludmVyc2VGdW5jdGlvbnMuamw=) | `100.00% <ø> (ø)` | |

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[oschulz]

If we do this, I think we should support Dates for <v1.9 as well (as a direct dependency), via a

@static if !isdefined(Base, :get_extension)
    include("../ext/DatesExt.jl")
end

[oschulz]

@aplavin , should we get this one "home"?

[aplavin]

Yes I think this is ready

[oschulz]

@devmotion any objections to merging and releasing?

[oschulz]

My apologies @aplavin , we lost track of this one. @devmotion any objections to merging this?

[oschulz]

I'm very sorry for the delay @aplavin ! Merging this now.

[oschulz]

https://github.com/JuliaRegistries/General/pull/103075