add gtime example test

[ansionfor]

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[codecov-commenter]

Codecov Report

Merging #1474 (15deeb1) into master (684fa9b) will increase coverage by 0.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1474      +/-   ##
==========================================
+ Coverage   69.81%   69.88%   +0.06%     
==========================================
  Files         404      404              
  Lines       39367    39367              
==========================================
+ Hits        27484    27510      +26     
+ Misses      10100    10072      -28     
- Partials     1783     1785       +2     

Flag	Coverage Δ
go-1.14	69.79% <ø> (+0.03%)	⬆️
go-1.15	69.84% <ø> (+0.11%)	⬆️
go-1.16	69.86% <ø> (+0.10%)	⬆️

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Impacted Files	Coverage Δ
os/gspath/gspath_cache.go	87.71% <0.00%> (-7.02%)	⬇️
container/gtree/gtree_btree.go	88.36% <0.00%> (+0.50%)	⬆️
os/gtime/gtime.go	81.81% <0.00%> (+0.86%)	⬆️
os/gtime/gtime_format.go	88.81% <0.00%> (+2.48%)	⬆️
os/gtime/gtime_time.go	79.82% <0.00%> (+9.01%)	⬆️

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