optimization omits unnecessary time conversion

[xuxiawei]

optimize the step of omitting time conversion milliseconds and then turning back time

What's the purpose of this PR

XXXXX

Which issue(s) this PR fixes:

Fixes #

Brief changelog

XXXXX

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[codecov-commenter]

Codecov Report

Merging #4118 (195a8ab) into master (4a20206) will increase coverage by 0.10%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master    #4118      +/-   ##
============================================
+ Coverage     52.52%   52.63%   +0.10%     
- Complexity     2616     2617       +1     
============================================
  Files           484      484              
  Lines         15206    15186      -20     
  Branches       1572     1572              
============================================
+ Hits           7987     7993       +6     
+ Misses         6667     6640      -27     
- Partials        552      553       +1     

Impacted Files	Coverage Δ
...amework/apollo/portal/util/RelativeDateFormat.java	0.00% <0.00%> (ø)
...o/openapi/filter/ConsumerAuthenticationFilter.java	94.11% <0.00%> (-5.89%)	⬇️
...work/apollo/biz/message/DatabaseMessageSender.java	64.58% <0.00%> (+14.58%)	⬆️

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[nobodyiam]

LGTM