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## org.apache.commons.validator.routines
Class DateValidator

    java.lang.Object
      |
      +--org.apache.commons.validator.routines.AbstractFormatValidator
            |
            +--org.apache.commons.validator.routines.AbstractCalendarValidator
                  |
                  +--org.apache.commons.validator.routines.DateValidator

All Implemented Interfaces:
  java.io.Serializable

public class DateValidator
extends AbstractCalendarValidator

Date Validation and Conversion routines (`java.util.Date`).

This validator provides a number of methods for validating/converting a `String` date value to a `java.util.Date` using `java.text.DateFormat` to parse either:

- using the default format for the default `Locale`
- using a specified pattern with the default `Locale`
- using the default format for a specified `Locale`
- using a specified pattern with a specified `Locale`

For each of the above mechanisms, conversion method (i.e the `validate` methods) implementations are provided which either use the default `TimeZone` or allow the `TimeZone` to be specified.

Use one of the `isValid()` methods to just validate or one of the `validate()` methods to validate and receive a converted `Date` value.

Implementations of the `validate()` method are provided to create `Date` objects for different time zones if the system default is not appropriate.

Once a value has been sucessfully converted the following methods can be used to perform various date comparison checks:

- `compareDates()` compares the day, month and year of two dates, returing 0, -1 or +1 indicating whether the first date is equal, before or after the second.
- `compareWeeks()` compares the week and year of two dates, returing 0, -1 or +1 indicating whether the first week is equal, before or after the second.
- `compareMonths()` compares the month and year of two dates, returing 0, -1 or +1 indicating whether the first month is equal, before or after the second.
- `compareQuarters()` compares the quarter and year of two dates, returing 0, -1 or +1 indicating whether the first quarter is equal, before or after the second.
- `compareYears()` compares the year of two dates, returing 0, -1 or +1 indicating whether the first year is equal, before or after the second.

So that the same mechanism used for parsing an input value for validation can be used to format output, corresponding `format()` methods are also provided. That is you can format either:

- using a specified pattern
- using the format for a specified `Locale`
- using the format for the default `Locale`

Since:
  Validator 1.3.0
Version:
  $Revision: 386637 $ $Date: 2006-03-17 13:22:26 +0000 (Fri, 17 Mar 2006) $
See Also:
  Serialized Form

Constructor Summary
`DateValidator()` Construct a strict instance with short date style.
`DateValidator(boolean strict, int dateStyle)` Construct an instance with the specified strict and date style parameters.

Method Summary
`int` | `compareDates(java.util.Date value, java.util.Date compare, java.util.TimeZone timeZone)` Compare Dates (day, month and year - not time).
`int` | `compareMonths(java.util.Date value, java.util.Date compare, java.util.TimeZone timeZone)` Compare Months (month and year).
`int` | `compareQuarters(java.util.Date value, java.util.Date compare, java.util.TimeZone timeZone)` Compare Quarters (quarter and year).
`int` | `compareQuarters(java.util.Date value, java.util.Date compare, java.util.TimeZone timeZone, int monthOfFirstQuarter)` Compare Quarters (quarter and year).
`int` | `compareWeeks(java.util.Date value, java.util.Date compare, java.util.TimeZone timeZone)` Compare Weeks (week and year).
`int` | `compareYears(java.util.Date value, java.util.Date compare, java.util.TimeZone timeZone)` Compare Years.
`static DateValidator` | `getInstance()` Return a singleton instance of this validator.
`protected java.lang.Object` | `processParsedValue(java.lang.Object value, java.text.Format formatter)` Returns the parsed `Date` unchanged.
`java.util.Date` | `validate(java.lang.String value)` Validate/convert a `Date` using the default `Locale` and `TimeZone`.
`java.util.Date` | `validate(java.lang.String value, java.util.Locale locale)` Validate/convert a `Date` using the specified `Locale` and default `TimeZone`.
`java.util.Date` | `validate(java.lang.String value, java.util.Locale locale, java.util.TimeZone timeZone)` Validate/convert a `Date` using the specified `Locale` and `TimeZone`.
`java.util.Date` | `validate(java.lang.String value, java.lang.String pattern)` Validate/convert a `Date` using the specified pattern and default `TimeZone`.
`java.util.Date` | `validate(java.lang.String value, java.lang.String pattern, java.util.Locale locale)` Validate/convert a `Date` using the specified pattern and `Locale` and the default `TimeZone`.
`java.util.Date` | `validate(java.lang.String value, java.lang.String pattern, java.util.Locale locale, java.util.TimeZone timeZone)` Validate/convert a `Date` using the specified pattern, and `Locale` and `TimeZone`.
`java.util.Date` | `validate(java.lang.String value, java.lang.String pattern, java.util.TimeZone timeZone)` Validate/convert a `Date` using the specified pattern and `TimeZone`.
`java.util.Date` | `validate(java.lang.String value, java.util.TimeZone timeZone)` Validate/convert a `Date` using the specified `TimeZone` and default `Locale`.

Methods inherited from class org.apache.commons.validator.routines.AbstractCalendarValidator
`compare, compareQuarters, compareTime, format, format, format, format, format, format, getFormat, getFormat, isValid, parse`

Methods inherited from class org.apache.commons.validator.routines.AbstractFormatValidator
`format, format, format, isStrict, isValid, isValid, isValid, parse`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### DateValidator

    public DateValidator()

  Construct a strict instance with short date style.

### DateValidator

    public DateValidator(boolean strict,
                         int dateStyle)

  Construct an instance with the specified strict and date style parameters.
  Parameters:
    `strict` - `true` if strict `Format` parsing should be used.
    `dateStyle` - the date style to use for Locale validation.

Method Detail

### getInstance

    public static DateValidator getInstance()

  Return a singleton instance of this validator.
  Returns:
    A singleton instance of the DateValidator.

### validate

    public java.util.Date validate(java.lang.String value)

  Validate/convert a `Date` using the default `Locale` and `TimeZone`.

  Parameters:
    `value` - The value validation is being performed on.
  Returns:
    The parsed `Date` if valid or `null` if invalid.

### validate

    public java.util.Date validate(java.lang.String value,
                                   java.util.TimeZone timeZone)

  Validate/convert a `Date` using the specified `TimeZone` and default `Locale`.

  Parameters:
    `value` - The value validation is being performed on.
    `timeZone` - The Time Zone used to parse the date, system default if null.
  Returns:
    The parsed `Date` if valid or `null` if invalid.

### validate

    public java.util.Date validate(java.lang.String value,
                                   java.lang.String pattern)

  Validate/convert a `Date` using the specified pattern and default `TimeZone`.

  Parameters:
    `value` - The value validation is being performed on.
    `pattern` - The pattern used to validate the value against, or the default for the `Locale` if `null`.
  Returns:
    The parsed `Date` if valid or `null` if invalid.

### validate

    public java.util.Date validate(java.lang.String value,
                                   java.lang.String pattern,
                                   java.util.TimeZone timeZone)

  Validate/convert a `Date` using the specified pattern and `TimeZone`.

  Parameters:
    `value` - The value validation is being performed on.
    `pattern` - The pattern used to validate the value against, or the default for the `Locale` if `null`.
    `timeZone` - The Time Zone used to parse the date, system default if null.
  Returns:
    The parsed `Date` if valid or `null` if invalid.

### validate

    public java.util.Date validate(java.lang.String value,
                                   java.util.Locale locale)

  Validate/convert a `Date` using the specified `Locale` and default `TimeZone`.

  Parameters:
    `value` - The value validation is being performed on.
    `locale` - The locale to use for the date format, system default if null.
  Returns:
    The parsed `Date` if valid or `null` if invalid.

### validate

    public java.util.Date validate(java.lang.String value,
                                   java.util.Locale locale,
                                   java.util.TimeZone timeZone)

  Validate/convert a `Date` using the specified `Locale` and `TimeZone`.

  Parameters:
    `value` - The value validation is being performed on.
    `locale` - The locale to use for the date format, system default if null.
    `timeZone` - The Time Zone used to parse the date, system default if null.
  Returns:
    The parsed `Date` if valid or `null` if invalid.

### validate

    public java.util.Date validate(java.lang.String value,
                                   java.lang.String pattern,
                                   java.util.Locale locale)

  Validate/convert a `Date` using the specified pattern and `Locale` and the default `TimeZone`.

  Parameters:
    `value` - The value validation is being performed on.
    `pattern` - The pattern used to validate the value against, or the default for the `Locale` if `null`.
    `locale` - The locale to use for the date format, system default if null.
  Returns:
    The parsed `Date` if valid or `null` if invalid.

### validate

    public java.util.Date validate(java.lang.String value,
                                   java.lang.String pattern,
                                   java.util.Locale locale,
                                   java.util.TimeZone timeZone)

  Validate/convert a `Date` using the specified pattern, and `Locale` and `TimeZone`.

  Parameters:
    `value` - The value validation is being performed on.
    `pattern` - The pattern used to validate the value against, or the default for the `Locale` if `null`.
    `locale` - The locale to use for the date format, system default if null.
    `timeZone` - The Time Zone used to parse the date, system default if null.
  Returns:
    The parsed `Date` if valid or `null` if invalid.

### compareDates

    public int compareDates(java.util.Date value,
                            java.util.Date compare,
                            java.util.TimeZone timeZone)

  Compare Dates (day, month and year - not time).

  Parameters:
    `value` - The `Calendar` value to check.
    `compare` - The `Calendar` to compare the value to.
    `timeZone` - The Time Zone used to compare the dates, system default if null.
  Returns:
    Zero if the dates are equal, -1 if first date is less than the seconds and +1 if the first date is greater than.

### compareWeeks

    public int compareWeeks(java.util.Date value,
                            java.util.Date compare,
                            java.util.TimeZone timeZone)

  Compare Weeks (week and year).

  Parameters:
    `value` - The `Date` value to check.
    `compare` - The `Date` to compare the value to.
    `timeZone` - The Time Zone used to compare the dates, system default if null.
  Returns:
    Zero if the weeks are equal, -1 if first parameter's week is less than the seconds and +1 if the first parameter's week is greater than.

### compareMonths

    public int compareMonths(java.util.Date value,
                             java.util.Date compare,
                             java.util.TimeZone timeZone)

  Compare Months (month and year).

  Parameters:
    `value` - The `Date` value to check.
    `compare` - The `Date` to compare the value to.
    `timeZone` - The Time Zone used to compare the dates, system default if null.
  Returns:
    Zero if the months are equal, -1 if first parameter's month is less than the seconds and +1 if the first parameter's month is greater than.

### compareQuarters

    public int compareQuarters(java.util.Date value,
                               java.util.Date compare,
                               java.util.TimeZone timeZone)

  Compare Quarters (quarter and year).

  Parameters:
    `value` - The `Date` value to check.
    `compare` - The `Date` to compare the value to.
    `timeZone` - The Time Zone used to compare the dates, system default if null.
  Returns:
    Zero if the months are equal, -1 if first parameter's quarter is less than the seconds and +1 if the first parameter's quarter is greater than.

### compareQuarters

    public int compareQuarters(java.util.Date value,
                               java.util.Date compare,
                               java.util.TimeZone timeZone,
                               int monthOfFirstQuarter)

  Compare Quarters (quarter and year).

  Parameters:
    `value` - The `Date` value to check.
    `compare` - The `Date` to compare the value to.
    `timeZone` - The Time Zone used to compare the dates, system default if null.
    `monthOfFirstQuarter` - The month that the first quarter starts.
  Returns:
    Zero if the quarters are equal, -1 if first parameter's quarter is less than the seconds and +1 if the first parameter's quarter is greater than.

### compareYears

    public int compareYears(java.util.Date value,
                            java.util.Date compare,
                            java.util.TimeZone timeZone)

  Compare Years.

  Parameters:
    `value` - The `Date` value to check.
    `compare` - The `Date` to compare the value to.
    `timeZone` - The Time Zone used to compare the dates, system default if null.
  Returns:
    Zero if the years are equal, -1 if first parameter's year is less than the seconds and +1 if the first parameter's year is greater than.

### processParsedValue

    protected java.lang.Object processParsedValue(java.lang.Object value,
                                                  java.text.Format formatter)

  Returns the parsed `Date` unchanged.

  Overrides:
    `processParsedValue` in class `AbstractCalendarValidator`
  Parameters:
    `value` - The parsed `Date` object created.
    `formatter` - The Format used to parse the value with.
  Returns:
    The parsed value converted to a `Calendar`.

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