account for optional Z in time strs

[sappelhoff]

PR Description

fix a problem that was reported here: https://mne.discourse.group/t/how-to-import-fnirs-data-from-a-local-dataset/8481/3?u=sappelhoff

cc @hoechenberger

Merge checklist

Maintainer, please confirm the following before merging.
If applicable:

• All comments are resolved
• This is not your own PR
• All CIs are happy
• PR title starts with [MRG]
• whats_new.rst is updated
• New contributors have been added to CITATION.cff
• PR description includes phrase "closes <#issue-number>"

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.60%. Comparing base (87eea28) to head (8566784).
Report is 15 commits behind head on main.

❗ Current head 8566784 differs from pull request most recent head f907308. Consider uploading reports for the commit f907308 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1240      +/-   ##
==========================================
- Coverage   97.61%   97.60%   -0.02%     
==========================================
  Files          40       40              
  Lines        8685     8682       -3     
==========================================
- Hits         8478     8474       -4     
- Misses        207      208       +1     

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[hoechenberger]

@sappelhoff I tried to give it a shot

Code isn't super pretty but I think the logical flow is very clear

Didn't run or write any tests yet

[hoechenberger]

I added some tests

[hoechenberger]

I think this should be good to go. Another example of a poorly designed part of BIDS, unfortunately.

[sappelhoff]

LGTM! Thanks a lot! Would you mind adding a changelog entry?

[sappelhoff]

Very kind of you to include me in the commit changelog message 🤣

Thanks, I think this is much saner behavior now!!

[hoechenberger]

Very kind of you to include me in the commit changelog message 🤣

yeah now worries, you started the PR after all :)

Thanks, I think this is much saner behavior now!!

let's hope I / we didn't overlook something here … but I think in any case, we're behaving more correctly now than before!