REF: de-duplicate datetimelike wrapping code

[jbrockmendel]

Should be orthogonal to other outstanding datetimelike index/array PRs

[pep8speaks]

Hello @jbrockmendel! Thanks for submitting the PR.

• There are no PEP8 issues in the file pandas/core/arrays/datetimelike.py !

• There are no PEP8 issues in the file pandas/core/indexes/datetimelike.py !

• There are no PEP8 issues in the file pandas/core/indexes/datetimes.py !

• There are no PEP8 issues in the file pandas/core/indexes/period.py !

• There are no PEP8 issues in the file pandas/core/indexes/timedeltas.py !

[codecov]

Codecov Report

Merging #23099 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master   #23099      +/-   ##
==========================================
- Coverage    92.2%   92.19%   -0.01%     
==========================================
  Files         169      169              
  Lines       50924    50863      -61     
==========================================
- Hits        46952    46893      -59     
+ Misses       3972     3970       -2

Flag	Coverage Δ
#multiple	90.61% <100%> (-0.01%)	⬇️
#single	42.26% <91.42%> (-0.05%)	⬇️

Impacted Files	Coverage Δ
pandas/core/indexes/period.py	93.26% <100%> (-0.18%)	⬇️
pandas/core/arrays/datetimelike.py	95.49% <100%> (-0.08%)	⬇️
pandas/core/indexes/datetimes.py	95.65% <100%> (-0.09%)	⬇️
pandas/core/indexes/datetimelike.py	98.23% <100%> (+0.11%)	⬆️
pandas/core/indexes/timedeltas.py	90.76% <100%> (-0.4%)	⬇️

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[jreback]

thanks!