[4.5] fix: use RDATE in time range check and use all instances

[phil-davis]

Backport of #735 to 4.5 branch

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.66%. Comparing base (6617864) to head (35f5b55).
⚠️ Report is 3 commits behind head on 4.5.

Additional details and impacted files

@@            Coverage Diff            @@
##                4.5     #746   +/-   ##
=========================================
  Coverage     98.65%   98.66%           
- Complexity     1933     1935    +2     
=========================================
  Files            71       71           
  Lines          5298     5301    +3     
=========================================
+ Hits           5227     5230    +3     
  Misses           71       71           

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