BetweenDatesValidator class

A validator that checks if the value date is between minDate and maxDate.

The BetweenDatesValidator can be used with FieldControllers holding values of type DateTime. It ensures that the value is is between minDate and maxDate.

If the value is null, it is treated as valid by default.

Properties

• minDate: The minimum allowed date for the value.
• maxDate: The maximum allowed date for the value.
• message: An optional custom error message to display when invalid.

Example

FieldController<DateTime> field = FieldController(
  key: 'date',
  validators: [BetweenDatesValidator(minDate: DateTime(2025, 7, 12), maxDate: DateTime(2025, 7, 14))],
);

// If field.value = DateTime(2025, 7, 11), validation fails.
// If field.value = DateTime(2025, 7, 15), validation fails.
// If field.value = DateTime(2025, 7, 12), validation passes.
// If field.value = DateTime(2025, 7, 13), validation passes.
// If field.value = DateTime(2025, 7, 14), validation passes.

See also

• FormyValidator, the base class for custom validators.
• ValidationResult, which describes the outcome of validation.
• FieldController, which holds the field value to be validated.