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## java.util
Class Date

Method Summary
`Date` | `clearTime()` Clears the time portion of this Date instance; useful utility where it makes sense to compare month/day/year only portions of a Date.
`String` | `format(String format)` Create a String representation of this date according to the given format pattern.
`String` | `format(String format, TimeZone tz)` Create a String representation of this date according to the given format pattern and timezone.
`int` | `getAt(int field)` Support the subscript operator for a Date.
`String` | `getDateString()` Return a string representation of the 'day' portion of this date according to the locale-specific DateFormat#SHORT default format.
`String` | `getDateTimeString()` Return a string representation of the date and time time portion of this Date instance, according to the locale-specific format used by DateFormat.
`String` | `getTimeString()` Return a string representation of the time portion of this date according to the locale-specific DateFormat#MEDIUM default format.
`Date` | `minus(int days)` Subtract a number of days from this date and returns the new date.
`int` | `minus(Date then)` Subtract another Date from this one and return the number of days of the difference.
`Date` | `next()` Increment a Date by one day.
`static Date` | `parse(String format, String input)` Parse a String into a Date instance using the given pattern.
`static Date` | `parseToStringDate(String dateToString)` Parse a String matching the pattern EEE MMM dd HH:mm:ss zzz yyyy containing US-locale-constants only (e.g.
`Date` | `plus(int days)` Add a number of days to this date and returns the new date.
`Date` | `previous()` Decrement a Date by one day.
`void` | `putAt(int field, int value)` Support the subscript operator for mutating a Date.
`void` | `set(Map updates)` Support mutating a Date with a Map.
`Calendar` | `toCalendar()` Convert a Date to a Calendar.
`Timestamp` | `toTimestamp()` Return a java.sql.Timestamp given a java.util.Date.
`Date` | `updated(Map updates)` Support creating a new Date having similar properties to an existing Date (which remains unaltered) but with some fields updated according to a Map of changes.

Method Detail

### clearTime

    public Date clearTime()

  Clears the time portion of this Date instance; useful utility where it makes sense to compare month/day/year only portions of a Date.

Returns:
  the Date but with the time portion cleared

Since:
  1.6.7

### format

    public String format(String format)

  Create a String representation of this date according to the given format pattern.

  For example, if the system timezone is GMT, `new Date(0).format('MM/dd/yy')` would return the string `"01/01/70"`. See documentation for SimpleDateFormat for format pattern use.

  Note that a new DateFormat instance is created for every invocation of this method (for thread safety).

Parameters:
  `format` - the format pattern to use according to SimpleDateFormat.

Returns:
  a string representation of this date.

Since:
  1.5.7

See:
  SimpleDateFormat.

### format

    public String format(String format, TimeZone tz)

  Create a String representation of this date according to the given format pattern and timezone.

  For example: `def d = new Date(0) def tz = TimeZone.getTimeZone('GMT') println d.format('dd/MMM/yyyy', tz)` would return the string `"01/Jan/1970"`. See documentation for SimpleDateFormat for format pattern use.

  Note that a new DateFormat instance is created for every invocation of this method (for thread safety).

Parameters:
  `format` - the format pattern to use according to SimpleDateFormat.
  `tz` - the TimeZone to use.

Returns:
  a string representation of this date.

Since:
  1.8.3

See:
  SimpleDateFormat.

### getAt

    public int getAt(int field)

  Support the subscript operator for a Date.

Parameters:
  `field` - a Calendar field, e.g. MONTH.

Returns:
  the value for the given field, e.g. FEBRUARY

Since:
  1.5.5

See:
  Calendar.

### getDateString

    public String getDateString()

  Return a string representation of the 'day' portion of this date according to the locale-specific DateFormat#SHORT default format. For an "en_UK" system locale, this would be `dd/MM/yy`.

  Note that a new DateFormat instance is created for every invocation of this method (for thread safety).

Returns:
  a string representation of this date

Since:
  1.5.7

See:
  DateFormat#getDateInstance.
  DateFormat#SHORT.

### getDateTimeString

    public String getDateTimeString()

  Return a string representation of the date and time time portion of this Date instance, according to the locale-specific format used by DateFormat. This method uses the DateFormat#SHORT preset for the day portion and DateFormat#MEDIUM for the time portion of the output string.

  Note that a new DateFormat instance is created for every invocation of this method (for thread safety).

Returns:
  a string representation of this date and time

Since:
  1.5.7

See:
  DateFormat#getDateTimeInstance.

### getTimeString

    public String getTimeString()

  Return a string representation of the time portion of this date according to the locale-specific DateFormat#MEDIUM default format. For an "en_UK" system locale, this would be `HH:MM:ss`.

  Note that a new DateFormat instance is created for every invocation of this method (for thread safety).

Returns:
  a string representing the time portion of this date

Since:
  1.5.7

See:
  DateFormat#getTimeInstance.
  DateFormat#MEDIUM.

### minus

    public Date minus(int days)

  Subtract a number of days from this date and returns the new date.

Parameters:
  `days` - the number of days to subtract.

Returns:
  the new date

Since:
  1.0

### minus

    public int minus(Date then)

  Subtract another Date from this one and return the number of days of the difference.

  Date self = Date then + (Date self - Date then)

  IOW, if self is before then the result is a negative value.

Parameters:
  `then` - another Date.

Returns:
  number of days

Since:
  1.6.0

### next

    public Date next()

  Increment a Date by one day.

Returns:
  the next days date

Since:
  1.0

### parse

    public static Date parse(String format, String input)

  Parse a String into a Date instance using the given pattern. This convenience method acts as a wrapper for SimpleDateFormat.

  Note that a new SimpleDateFormat instance is created for every invocation of this method (for thread safety).

Parameters:
  `format` - pattern used to parse the input string..
  `input` - String to be parsed to create the date instance.

Returns:
  a new Date instance representing the parsed input string

Since:
  1.5.7

See:
  SimpleDateFormat#parse.

### parseToStringDate

    public static Date parseToStringDate(String dateToString)

  Parse a String matching the pattern EEE MMM dd HH:mm:ss zzz yyyy containing US-locale-constants only (e.g. Sat for Saturdays). Such a string is generated by the toString method of Date

  Note that a new SimpleDateFormat instance is created for every invocation of this method (for thread safety).

Parameters:
  `dateToString` - String to be parsed to create the date instance. Must match the pattern EEE MMM dd HH:mm:ss zzz yyyy with US-locale symbols.

Returns:
  a new Date instance representing the parsed input string

### plus

    public Date plus(int days)

  Add a number of days to this date and returns the new date.

Parameters:
  `days` - the number of days to increase.

Returns:
  the new date

Since:
  1.0

### previous

    public Date previous()

  Decrement a Date by one day.

Returns:
  the previous days date

Since:
  1.0

### putAt

    public void putAt(int field, int value)

  Support the subscript operator for mutating a Date.

Parameters:
  `field` - A Calendar field, e.g. MONTH.
  `value` - The value for the given field, e.g. FEBRUARY.

Since:
  1.7.3

See:
  Calendar#putAt.
  Calendar#set.

### set

    public void set(Map updates)

  Support mutating a Date with a Map.

  Example usage:

      import static java.util.Calendar.YEAR
      def date = new Date()
      def nextYear = date[YEAR] + 1
      date.set(year: nextYear)
      println date

Parameters:
  `updates` - A Map of Calendar keys and values.

Since:
  1.7.3

See:
  Calendar#set.
  Calendar#set.

### toCalendar

    public Calendar toCalendar()

  Convert a Date to a Calendar.

Returns:
  a Calendar corresponding to the given Date

Since:
  1.7.6

### toTimestamp

    public Timestamp toTimestamp()

  Return a java.sql.Timestamp given a java.util.Date.

Returns:
  the date wrapped as a Timestamp

Since:
  1.6.6

### updated

    public Date updated(Map updates)

  Support creating a new Date having similar properties to an existing Date (which remains unaltered) but with some fields updated according to a Map of changes.

  Example usage:

      import static java.util.Calendar.YEAR
      def today = new Date()
      def nextYear = today[YEAR] + 1
      def oneYearFromNow = today.updated(year: nextYear)
      println today
      println oneYearFromNow

Parameters:
  `updates` - A Map of Calendar keys and values.

Returns:
  The newly created Date

Since:
  1.7.3

See:
  Calendar#set.
  Date#set.
  Calendar#set.
  Calendar#updated.

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