{"id":"53de81dee5ebf117","repo":"gofiber/fiber","slug":"datetime-constraint-requires-a-layout-argument","errorCode":null,"errorMessage":"datetime constraint requires a layout argument","messagePattern":"datetime constraint requires a layout argument","errorType":"validation","errorClass":null,"httpStatus":null,"severity":"error","filePath":"constraint.go","lineNumber":314,"sourceCode":"\t}\n\treturn true\n}\n\ntype guidConstraintType struct{}\n\nfunc (guidConstraintType) Name() string { return ConstraintGUID }\nfunc (guidConstraintType) Execute(param string, _ []any) bool {\n\t_, err := uuid.Parse(param)\n\treturn err == nil\n}\n\ntype datetimeConstraintType struct{}\n\nfunc (datetimeConstraintType) Name() string { return ConstraintDatetime }\nfunc (datetimeConstraintType) Analyze(args []string) ([]any, error) {\n\targs = parseConstraintArgs(args)\n\tif len(args) == 0 {\n\t\treturn nil, errors.New(\"datetime constraint requires a layout argument\")\n\t}\n\treturn []any{args[0]}, nil\n}\n\nfunc (datetimeConstraintType) Execute(param string, data []any) bool {\n\tif len(data) == 0 {\n\t\treturn false\n\t}\n\tlayout, ok := data[0].(string)\n\tif !ok || layout == \"\" {\n\t\treturn false\n\t}\n\t_, err := time.Parse(layout, param)\n\treturn err == nil\n}\n\ntype minLenConstraintType struct{}\n","sourceCodeStart":296,"sourceCodeEnd":332,"githubUrl":"https://github.com/gofiber/fiber/blob/9a4c7e57fe0b080a04235d28a4b0d2b4b353d58c/constraint.go#L296-L332","documentation":"Error \"datetime constraint requires a layout argument\" thrown in gofiber/fiber.","triggerScenarios":"Thrown at constraint.go:314 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":[],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"analyzedSha":"9a4c7e57fe0b080a04235d28a4b0d2b4b353d58c","analyzedAt":"2026-08-04T21:44:03.395Z","schemaVersion":2}