feat: support TOML 1.1

Assisted-by: GLM 5.3 Flash

datetime.go

@@ -59,24 +59,31 @@ var (
 		"2006-01-02T15:04:05Z07:00",
 		"2006-01-02 15:04:05.999999999Z07:00",
 		"2006-01-02 15:04:05Z07:00",
+		// TOML 1.1 makes the seconds optional.
+		"2006-01-02T15:04Z07:00",
+		"2006-01-02 15:04Z07:00",
 	}
 	localDateTimeLayouts = []string{
 		"2006-01-02T15:04:05.999999999",
 		"2006-01-02T15:04:05",
 		"2006-01-02 15:04:05.999999999",
 		"2006-01-02 15:04:05",
+		"2006-01-02T15:04",
+		"2006-01-02 15:04",
 	}
 	localTimeLayouts = []string{
 		"15:04:05.999999999",
 		"15:04:05",
+		"15:04",
 	}
 )
 
-// dateTimeShape enforces the strict TOML grammar (two-digit components) that
-// time.Parse would otherwise accept loosely (e.g. a single-digit hour).
+// dateTimeShape enforces the strict TOML grammar (two-digit components,
+// seconds optional since 1.1, a fraction only after seconds) that time.Parse
+// would otherwise accept loosely (e.g. a single-digit hour).
 var dateTimeShape = regexp.MustCompile(
-	`^\d{4}-\d{2}-\d{2}([Tt ]\d{2}:\d{2}:\d{2}(\.\d+)?([Zz]|[+-]\d{2}:\d{2})?)?$` +
-		`|^\d{2}:\d{2}:\d{2}(\.\d+)?$`,
+	`^\d{4}-\d{2}-\d{2}([Tt ]\d{2}:\d{2}(:\d{2}(\.\d+)?)?([Zz]|[+-]\d{2}:\d{2})?)?$` +
+		`|^\d{2}:\d{2}(:\d{2}(\.\d+)?)?$`,
 )
 
 // offsetBounds extracts the numeric offset of a date-time. The ABNF bounds it