fix 'Clear' datetime string

[LaurensBurger]

No description provided.

[codecov-commenter]

Codecov Report

Merging #312 (5f3b83a) into develop (98d74bb) will decrease coverage by 0.04%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop     #312      +/-   ##
===========================================
- Coverage    96.57%   96.52%   -0.05%     
===========================================
  Files          416      416              
  Lines        12624    12630       +6     
===========================================
  Hits         12191    12191              
- Misses         433      439       +6     

Impacted Files	Coverage Δ
src/open_inwoner/plans/models.py	91.42% <0.00%> (-6.85%)	⬇️
src/open_inwoner/accounts/views/invite.py	90.32% <0.00%> (-2.79%)	⬇️
src/open_inwoner/accounts/views/registration.py	98.70% <0.00%> (-0.07%)	⬇️
src/open_inwoner/accounts/views/profile.py	100.00% <0.00%> (ø)
src/open_inwoner/accounts/views/contacts.py	98.85% <0.00%> (ø)
src/open_inwoner/accounts/tests/test_auth.py	100.00% <0.00%> (ø)
src/open_inwoner/plans/views.py	98.90% <0.00%> (+<0.01%)	⬆️
src/open_inwoner/accounts/forms.py	97.83% <0.00%> (+0.01%)	⬆️
src/open_inwoner/accounts/admin.py	98.30% <0.00%> (+0.02%)	⬆️

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[alextreme]

Dat viel reuze mee 👍