Invalid error message for nonexistent leap days

[mingyuannus]

If a Feb 29 that does not exist is entered as the date using the correct format, the error message shows that the date format is invalid.

Steps to reproduce

add expense /c test /de test /da 29-02-2022 /v 1

Expected

Error message saying that the date does not exist.

Actual

Error message saying that date format is invalid.

[nus-pe-bot]

Team's Response

Valid implies being supported by objective truth or generally accepted authority. So dates that do not exist are not valid (rejected).

Items for the Tester to Verify

❓ Issue response

Team chose [response.Rejected]

• I disagree

Reason for disagreement: [replace this with your explanation]

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❓ Issue severity

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

• I disagree

Reason for disagreement: [replace this with your explanation]

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