Add Date semantics to Timestamp

[wlren]

No description provided.

[jeffsieu]

Hmm...

[codecov-commenter]

Codecov Report

Merging #89 (c6de922) into master (6e34d06) will decrease coverage by 0.03%.
The diff coverage is 38.46%.

@@             Coverage Diff              @@
##             master      #89      +/-   ##
============================================
- Coverage     57.82%   57.79%   -0.04%     
- Complexity      555      567      +12     
============================================
  Files           110      110              
  Lines          2314     2400      +86     
  Branches        221      233      +12     
============================================
+ Hits           1338     1387      +49     
- Misses          898      931      +33     
- Partials         78       82       +4     

Impacted Files	Coverage Δ
...in/java/seedu/address/storage/JsonAdaptedTask.java	0.00% <0.00%> (ø)
src/main/java/seedu/address/ui/EditTaskDialog.java	0.00% <0.00%> (ø)
src/main/java/seedu/address/ui/TaskCard.java	0.00% <0.00%> (ø)
src/main/java/seedu/address/model/task/Task.java	68.96% <28.57%> (-11.04%)	⬇️
.../main/java/seedu/address/model/task/Timestamp.java	41.17% <46.15%> (-15.97%)	⬇️
...in/java/seedu/address/logic/parser/ParserUtil.java	88.23% <100.00%> (+0.23%)	⬆️
...ddress/logic/parser/task/AddTaskCommandParser.java	100.00% <100.00%> (ø)
...dress/logic/parser/task/EditTaskCommandParser.java	72.97% <100.00%> (-0.72%)	⬇️
...u/address/logic/commands/task/FindTaskCommand.java	56.52% <0.00%> (-43.48%)	⬇️
... and 14 more

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