fix: init date format otherwise no timestamp is present in logs

[freef4ll]

Since #81, if dateFormat is not initialized, time stamp is not going to be logged.

Update the example to reflect this.

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (903bdd2) 97.18% compared to head (3324c3d) 97.18%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #88   +/-   ##
=======================================
  Coverage   97.18%   97.18%           
=======================================
  Files          12       12           
  Lines         639      639           
=======================================
  Hits          621      621           
  Misses         18       18           

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[sushichop]

@freef4ll Thanks!