fix for crash that may occur on different timezones

[niktechnopro]

we have noticed that react-datepicker may crash with message: "cannot read properties of undefined offsetTop". The following fix solves that issue. The crash occurs when we set local timezone (on local machine) to the west from timezone passed to react-datepicker.

[codecov[bot]]

Codecov Report

Merging #3702 (269f8ca) into master (1d84d31) will increase coverage by 0.00%. The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master    #3702   +/-   ##
=======================================
  Coverage   93.34%   93.34%           
=======================================
  Files          20       20           
  Lines        1352     1353    +1     
  Branches      377      378    +1     
=======================================
+ Hits         1262     1263    +1     
+ Misses         27       26    -1     
- Partials       63       64    +1     

Impacted Files	Coverage Δ
src/time.jsx	90.00% <0.00%> (-1.53%)	:arrow_down:
src/year.jsx	94.23% <0.00%> (+1.92%)	:arrow_up:

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