fix the microsec process for datetime

[Nicole00]

No description provided.

[codecov-commenter]

Codecov Report

Merging #34 (50f2457) into master (cd851ea) will increase coverage by 0.06%.
The diff coverage is 64.28%.

@@             Coverage Diff              @@
##             master      #34      +/-   ##
============================================
+ Coverage     28.07%   28.14%   +0.06%     
  Complexity        6        6              
============================================
  Files            24       24              
  Lines          2112     2114       +2     
  Branches        396      396              
============================================
+ Hits            593      595       +2     
  Misses         1412     1412              
  Partials        107      107              

Impacted Files	Coverage Δ
...m/vesoft/nebula/exchange/processor/Processor.scala	64.56% <64.28%> (+0.56%)	⬆️

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