User might put t/Sunday-1100-0100 because they don't understand that HH means 24 hours formatting.
And the error message and UG is not clear enough on this.
Moreover, the error message state that the range is 0000-2359. That means the input is still considered valid because both 1100 and 0100 is within the range.
Suggestion: Explain in UG that HHmm means 24 hours formatting.

User might put
t/Sunday-1100-0100because they don't understand that HH means 24 hours formatting.And the error message and UG is not clear enough on this.
Moreover, the error message state that the range is 0000-2359. That means the input is still considered valid because both 1100 and 0100 is within the range.
Suggestion: Explain in UG that HHmm means 24 hours formatting.