enhance datetimetick formatting

[muendlein]

All pull requests must have an associated issue in the issue tracker. If there
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• issues: fixes [FEATURE] datetime formatting: enhance default formatting #13186
• tests added / passed
• release document entry (if new feature or API change)

[codecov]

Codecov Report

Merging #13455 (8614fcd) into branch-3.4 (b0a59ca) will decrease coverage by 0.02%.
Report is 1 commits behind head on branch-3.4.
The diff coverage is 85.71%.

@@              Coverage Diff               @@
##           branch-3.4   #13455      +/-   ##
==============================================
- Coverage       92.67%   92.65%   -0.02%     
==============================================
  Files             320      320              
  Lines           20361    20367       +6     
==============================================
+ Hits            18869    18871       +2     
- Misses           1492     1496       +4     

[bryevdv]

@muendlein There seems to be three things in this PR:

• hiding repeats
• scaling up on boundaries
• adding default contexts

is that accurate? If so, I would suggest splitting this into 3 chunks of work. The first two seem fairly straightforward, but the third may require some thought so it will be easier to evaluate and iterate on isolation.

[muendlein]

@bryevdv Yes that's accurate, should I provide three separate pull requests for each chunk?

[bryevdv]

@muendlein I think that would ideal I think we can speed through things more quickly with smaller individual PRs

[muendlein]

Closing this PR as it will be split up into separate ones.