Fix invalid day bug

[AlyssaPng]

fix #241

[sopa301]

Thanks for the good effort. I think the SLAP is done quite well, though the naming could be a bit more intuitive. Some other things I noticed:

• Javadoc for parseAppointment (aptName and aptDate are outdated).
• (Nitpick) The validation for the Date and date part of DateTime is duplicated. Perhaps we could extract it into a method?

[sopa301]

@Kb-Tay I'd like your input on these too, since you're the original author of this code.
@jylow Maybe you could do that bug finding magic with this as well?

[Kb-Tay]

Overall, the code implemention is good in readability and has appropiate SLAP. However, can make some edits to prevent repetition of code. Can also consider including more test cases to ensure its comprehensiveness

[sopa301]

LGTM

[codecov]

Codecov Report

Merging #256 (dcd9d97) into master (ed176dc) will decrease coverage by 0.04%.
Report is 6 commits behind head on master.
The diff coverage is 86.36%.

@@             Coverage Diff              @@
##             master     #256      +/-   ##
============================================
- Coverage     75.53%   75.49%   -0.04%     
- Complexity      670      676       +6     
============================================
  Files           103      103              
  Lines          2166     2175       +9     
  Branches        220      223       +3     
============================================
+ Hits           1636     1642       +6     
- Misses          467      469       +2     
- Partials         63       64       +1     

Files	Coverage Δ
.../seedu/address/logic/commands/ScheduleCommand.java	61.29% <ø> (ø)
...a/seedu/address/model/appointment/Appointment.java	85.00% <100.00%> (+0.38%)	⬆️
...in/java/seedu/address/logic/parser/ParserUtil.java	94.00% <82.35%> (-2.74%)	⬇️

... and 1 file with indirect coverage changes

📣 Codecov offers a browser extension for seamless coverage viewing on GitHub. Try it in Chrome or Firefox today!