fix(builder): keep the time of day when a zone item is combined with a relative item

[sylvestre]

follow up of #320

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.34%. Comparing base (390c747) to head (1c2efe4).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #324      +/-   ##
==========================================
- Coverage   99.34%   99.34%   -0.01%     
==========================================
  Files          21       21              
  Lines        4125     4123       -2     
  Branches      136      136              
==========================================
- Hits         4098     4096       -2     
  Misses         26       26              
  Partials        1        1              

Flag	Coverage Δ
macos_latest	99.34% <100.00%> (-0.01%)	⬇️
ubuntu_latest	99.34% <100.00%> (-0.01%)	⬇️
windows_latest	13.72% <0.00%> (+<0.01%)	⬆️

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