fix(cron): next time calculation for expressions with L or W modifiers

[reugn]

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[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.66%. Comparing base (e6d6b95) to head (9de7f64).
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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #168   +/-   ##
=======================================
  Coverage   94.66%   94.66%           
=======================================
  Files          20       20           
  Lines        1255     1255           
=======================================
  Hits         1188     1188           
  Misses         49       49           
  Partials       18       18           

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