fix: use c_time instead of m_time

[34j]

Description of change

Pull-Request Checklist

• Code is up-to-date with the main branch
• This pull request follows Contributing.md
• This pull request links relevant issues as Fixes #0000
• There are new or updated unit tests validating the change
• Documentation has been updated to reflect this change
• The new commits follow conventions outlined in the conventional commit spec, such as "fix(api): prevent racing of requests".

• If pre-commit.ci is failing, try pre-commit run -a for further information.
• If CI / test is failing, try poetry run pytest for further information.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 51.14%. Comparing base (307c3f0) to head (69433b0).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/vr180_convert/cli.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #75   +/-   ##
=======================================
  Coverage   51.14%   51.14%           
=======================================
  Files           6        6           
  Lines         614      614           
  Branches      112      112           
=======================================
  Hits          314      314           
  Misses        275      275           
  Partials       25       25           

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