clarify datetime arg

[emphasize]

Some additions to document the usage of a datetime arg

[codecov]

Codecov Report

Attention: 11 lines in your changes are missing coverage. Please review.

Comparison is base (d4d38ed) 41.43% compared to head (be47587) 41.38%.
Report is 2 commits behind head on dev.

Files	Patch %	Lines
ovos_utils/log_parser.py	0.00%	10 Missing ⚠️
ovos_utils/version.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #219      +/-   ##
==========================================
- Coverage   41.43%   41.38%   -0.06%     
==========================================
  Files          31       31              
  Lines        3024     3028       +4     
==========================================
  Hits         1253     1253              
- Misses       1771     1775       +4     

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