[Bug] Default date detection rejects yyyy/MM/dd while accepting slash date-times #1154

Fesod version

Current main at 5a9a16b.

Description

Automatic date-format detection supports slash-separated date-time strings, but a 10-character date is always assigned yyyy-MM-dd. Consequently, yyyy/MM/dd fails unless the user supplies an explicit @DateTimeFormat.

Location

fesod-sheet/src/main/java/org/apache/fesod/sheet/util/DateUtils.java:184-205

Reproduction

DateUtils.parseLocalDate("2024/01/02", null, Locale.US);
// DateTimeParseException

DateUtils.parseLocalDateTime("2024/01/02 03:04:05", null, Locale.US);
// succeeds

switchDateFormat("2024/01/02") returns yyyy-MM-dd, while the 16- and 19-character branches already select slash-specific formats.

Expected behavior

The default parser should accept yyyy/MM/dd consistently with the supported slash-separated date-time formats.

Suggested fix

Add a yyyy/MM/dd format constant, select it for 10-character strings containing /, and add Date/LocalDate converter tests.

Related existing work

#1040 concerns locale handling for java.util.Date; it does not cover delimiter detection.

Are you willing to submit a PR?

Yes.