Not adhering to date format causes program crash for `btw_ex`

[rizemon]

Input: btw_ex s/10/08/2021 e/23:12/2021

Specifying an invalid date format causes the program to crash with an exception.

[nus-se-script]

Team's Response

No details provided by team.

The 'Original' Bug

[The team marked this bug as a duplicate of the following bug]

btw_ex command dates

Accidentally using a wrong date format (12-12-2021) will crash the entire program.

---

_{[original: nus-cs2113-AY2122S1/pe-interim#2214] [original labels: type.FeatureFlaw severity.Medium]}

Their Response to the 'Original' Bug

[This is the team's response to the above 'original' bug]

No details provided by team.

Items for the Tester to Verify

❓ Issue duplicate status

Team chose to mark this issue as a duplicate of another issue (as explained in the Team's response above)

• I disagree

Reason for disagreement: [replace this with your explanation]

---

❓ Issue severity

Team chose [severity.Medium]
Originally [severity.High]

• I disagree

Reason for disagreement: [replace this with your explanation]

---