Branch feature countdown event date bug fix

[cwenling]

No description provided.

[codecov-io]

Codecov Report

Merging #202 (d1a9416) into master (6a4e167) will increase coverage by 0.01%.
The diff coverage is 66.66%.

@@             Coverage Diff              @@
##             master     #202      +/-   ##
============================================
+ Coverage     63.59%   63.61%   +0.01%     
- Complexity      816      821       +5     
============================================
  Files           126      126              
  Lines          2923     2930       +7     
  Branches        363      368       +5     
============================================
+ Hits           1859     1864       +5     
+ Misses          942      941       -1     
- Partials        122      125       +3     

Impacted Files	Coverage Δ	Complexity Δ
.../java/seedu/tr4cker/model/countdown/EventDate.java	91.17% <66.66%> (-5.12%)	20.00 <5.00> (+5.00)	⬇️

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[ruilingk]

lgtm