Make seconds optional in parse_time time formats

[tomasr8]

This addresses the crash by making the seconds optional. If the time format only contains hours and minutes, seconds are assumed to be zero.

closes #1129

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.32%. Comparing base (f1c8633) to head (315fdcc).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1141   +/-   ##
=======================================
  Coverage   91.31%   91.32%           
=======================================
  Files          27       27           
  Lines        4618     4620    +2     
=======================================
+ Hits         4217     4219    +2     
  Misses        401      401           

Flag	Coverage Δ
macos-12-3.10	90.08% <100.00%> (+<0.01%)	⬆️
macos-12-3.11	90.02% <100.00%> (+<0.01%)	⬆️
macos-12-3.12	90.23% <100.00%> (+<0.01%)	⬆️
macos-12-3.13-dev	89.76% <100.00%> (+<0.01%)	⬆️
macos-12-3.8	90.01% <100.00%> (+<0.01%)	⬆️
macos-12-3.9	90.01% <100.00%> (+<0.01%)	⬆️
macos-12-pypy3.10	90.08% <100.00%> (+<0.01%)	⬆️
ubuntu-22.04-3.10	90.10% <100.00%> (+<0.01%)	⬆️
ubuntu-22.04-3.11	90.04% <100.00%> (+<0.01%)	⬆️
ubuntu-22.04-3.12	90.25% <100.00%> (+<0.01%)	⬆️
ubuntu-22.04-3.13-dev	89.78% <100.00%> (+<0.01%)	⬆️
ubuntu-22.04-3.8	90.03% <100.00%> (+<0.01%)	⬆️
ubuntu-22.04-3.9	90.03% <100.00%> (+<0.01%)	⬆️
ubuntu-22.04-pypy3.10	90.10% <100.00%> (+<0.01%)	⬆️
windows-2022-3.10	90.22% <100.00%> (+<0.01%)	⬆️
windows-2022-3.11	90.16% <100.00%> (+<0.01%)	⬆️
windows-2022-3.12	90.37% <100.00%> (+<0.01%)	⬆️
windows-2022-3.13-dev	89.90% <100.00%> (+<0.01%)	⬆️
windows-2022-3.8	90.15% <100.00%> (+<0.01%)	⬆️
windows-2022-3.9	90.15% <100.00%> (+<0.01%)	⬆️
windows-2022-pypy3.10	90.22% <100.00%> (+<0.01%)	⬆️

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[akx]

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