fix timestamp format

[wenxi-zeng]

fix #200

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (2908754) 78.53% compared to head (9e5982c) 78.63%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
...t/analytics/kotlin/core/utilities/DateTimeUtils.kt	66.66%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #204      +/-   ##
============================================
+ Coverage     78.53%   78.63%   +0.10%     
- Complexity      494      509      +15     
============================================
  Files            78       78              
  Lines          6591     6587       -4     
  Branches        833      832       -1     
============================================
+ Hits           5176     5180       +4     
+ Misses          741      735       -6     
+ Partials        674      672       -2     

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