Package: org.apache.groovy.dateutil.extensions

## [Java] Class DateUtilExtensions

- org.apache.groovy.dateutil.extensions.DateUtilExtensions

-     public final class DateUtilExtensions
      extends Object

  This class defines new groovy methods which appear on normal JDK Date and Calendar classes inside the Groovy environment.

- - ### Methods Summary

    Methods
    Type Params | Return Type | Name and description
    --- | --- | ---
    `` | `public static Date` | `clearTime(Date self)` Clears the time portion of this Date instance; useful utility where it makes sense to compare month/day/year only portions of a Date.
    `` | `public static Date` | `clearTime(Date self)` Clears the time portion of this java.sql.Date instance; useful utility where it makes sense to compare month/day/year only portions of a Date.
    `` | `public static Calendar` | `clearTime(Calendar self)` Clears the time portion of this Calendar instance; useful utility where it makes sense to compare month/day/year only portions of a Calendar.
    `` | `public static Calendar` | `copyWith(Calendar self, Map<Object, Integer> 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.
    `` | `public static Date` | `copyWith(Date self, Map<Object, Integer> 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.
    `` | `public static void` | `downto(Date self, Date to, Closure closure)` Iterates from this date down to the given date, inclusive, decrementing by one day each time.
    `` | `public static void` | `downto(Calendar self, Calendar to, Closure closure)` Iterates from the date represented by this calendar up to the date represented by the given calendar, inclusive, incrementing by one day each time.
    `` | `public static String` | `format(Date self, String format)`
    `` | `public static String` | `format(Date self, String format, TimeZone tz)`
    `` | `public static String` | `format(Calendar self, String pattern)`
    `` | `public static int` | `getAt(Date self, int field)` Support the subscript operator for a Date.
    `` | `public static List<Integer>` | `getAt(Date self, Collection fields)` Support the subscript operator for a Date with a collection of indices.
    `` | `public static int` | `getAt(Calendar self, int field)` Support the subscript operator for a Calendar.
    `` | `public static List<Integer>` | `getAt(Calendar self, Collection fields)` Support the subscript operator for a Calendar with a collection of indices.
    `` | `public static String` | `getDateString(Date self)`
    `` | `public static String` | `getDateTimeString(Date self)`
    `` | `public static String` | `getTimeString(Date self)`
    `` | `public static Date` | `minus(Date self, int days)` Subtract a number of days from this date and returns the new date.
    `` | `public static Date` | `minus(Date self, int days)` Subtract a number of days from this date and returns the new date.
    `` | `public static Timestamp` | `minus(Timestamp self, int days)` Subtract a number of days from this Timestamp and returns the new Timestamp object.
    `` | `public static int` | `minus(Calendar self, Calendar then)` Subtract another date from this one and return the number of days of the difference.
    `` | `public static int` | `minus(Date self, Date then)` Subtract another Date from this one and return the number of days of the difference.
    `` | `public static Date` | `next(Date self)` Increment a Date by one day.
    `` | `public static Calendar` | `next(Calendar self)` Increment a Calendar by one day.
    `` | `public static Date` | `next(Date self)` Increment a java.sql.Date by one day.
    `` | `public static Date` | `plus(Date self, int days)` Add a number of days to this date and returns the new date.
    `` | `public static Date` | `plus(Date self, int days)` Add a number of days to this date and returns the new date.
    `` | `public static Timestamp` | `plus(Timestamp self, int days)` Add number of days to this Timestamp and returns the new Timestamp object.
    `` | `public static Calendar` | `previous(Calendar self)` Decrement a Calendar by one day.
    `` | `public static Date` | `previous(Date self)` Decrement a Date by one day.
    `` | `public static Date` | `previous(Date self)` Decrement a java.sql.Date by one day.
    `` | `public static void` | `putAt(Calendar self, int field, int value)` Support the subscript operator for mutating a Calendar.
    `` | `public static void` | `putAt(Date self, int field, int value)` Support the subscript operator for mutating a Date.
    `` | `public static void` | `set(Calendar self, Map<Object, Integer> updates)` Support mutating a Calendar with a Map.
    `` | `public static void` | `set(Date self, Map<Object, Integer> updates)` Support mutating a Date with a Map.
    `` | `public static Calendar` | `toCalendar(Date self)` Convert a Date to a Calendar.
    `` | `public static Calendar` | `updated(Calendar self, Map<Object, Integer> updates)` Legacy alias for copyWith.
    `` | `public static Date` | `updated(Date self, Map<Object, Integer> updates)` Legacy alias for copyWith.
    `` | `public static void` | `upto(Date self, Date to, Closure closure)` Iterates from this date up to the given date, inclusive, incrementing by one day each time.
    `` | `public static void` | `upto(Calendar self, Calendar to, Closure closure)` Iterates from the date represented by this calendar up to the date represented by the given calendar, inclusive, incrementing by one day each time.

  - ### Inherited Methods Summary

    Inherited Methods
    Methods inherited from class | Name
    --- | ---
    `class Object` | `equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Method Detail

    - #### public static Date clearTime(Date self)

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

      Parameters:
        `self` - a Date
      Returns:
        the Date but with the time portion cleared
      Since:
        1.6.7

    - #### public static Date clearTime(Date self)

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

      Parameters:
        `self` - a java.sql.Date
      Returns:
        the java.sql.Date but with the time portion cleared
      Since:
        1.6.7

    - #### public static Calendar clearTime(Calendar self)

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

      Parameters:
        `self` - a Calendar
      Returns:
        the Calendar but with the time portion cleared
      Since:
        1.6.7

    - #### public static Calendar copyWith(Calendar self, Map<Object, Integer> 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 now = Calendar.instance
           def nextYear = now[YEAR] + 1
           def oneYearFromNow = now.copyWith(year: nextYear)
           println now.time
           println oneYearFromNow.time

      Parameters:
        `self` - A Calendar
        `updates` - A Map of Calendar keys and values
      Returns:
        The newly created Calendar
      See Also:
        Calendar.set
        Calendar.set
        set(java.util.Calendar, java.util.Map)
      Since:
        2.2.0

    - #### public static Date copyWith(Date self, Map<Object, Integer> 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.copyWith(year: nextYear)
           println today
           println oneYearFromNow

      Parameters:
        `self` - A Date
        `updates` - A Map of Calendar keys and values
      Returns:
        The newly created Date
      See Also:
        Calendar.set
        set(java.util.Date, java.util.Map)
        copyWith(java.util.Calendar, java.util.Map)
      Since:
        2.2.0

    - #### public static void downto(Date self, Date to, Closure closure)

      Iterates from this date down to the given date, inclusive, decrementing by one day each time.

      Parameters:
        `self` - a Date
        `to` - another Date to go down to
        `closure` - the closure to call
      Since:
        2.2

    - #### public static void downto(Calendar self, Calendar to, Closure closure)

      Iterates from the date represented by this calendar up to the date represented by the given calendar, inclusive, incrementing by one day each time.

      Parameters:
        `self` - a Calendar
        `to` - another Calendar to go down to
        `closure` - the closure to call
      Since:
        2.2

    - #### public static String format(Date self, 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:
        `self` - a Date
        `format` - the format pattern to use according to SimpleDateFormat
      Returns:
        a string representation of this date.
      See Also:
        SimpleDateFormat
      Since:
        1.5.7

    - #### public static String format(Date self, 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:
        `self` - a Date
        `format` - the format pattern to use according to SimpleDateFormat
        `tz` - the TimeZone to use
      Returns:
        a string representation of this date.
      See Also:
        SimpleDateFormat
      Since:
        1.8.3

    - #### public static String format(Calendar self, String pattern)

      Shortcut for SimpleDateFormat to output a String representation of this calendar instance. This method respects the Calendar's assigned TimeZone, whereas calling `cal.time.format('HH:mm:ss')` would use the system timezone.

      Note that Calendar equivalents of `date.getDateString()` and variants do not exist because those methods are Locale-dependent. Although a Calendar may be assigned a Locale, that information is lost and therefore cannot be used to control the default date/time formats provided by these methods. Instead, the system Locale would always be used. The alternative is to simply call DateFormat.getDateInstance and pass the same Locale that was used for the Calendar.

      Parameters:
        `self` - this calendar
        `pattern` - format pattern
      Returns:
        String representation of this calendar with the given format.
      See Also:
        DateFormat.setTimeZone
        SimpleDateFormat.format
        format(java.util.Date, String)
      Since:
        1.6.0

    - #### public static int getAt(Date self, int field)

      Support the subscript operator for a Date.

      Parameters:
        `self` - a Date
        `field` - a Calendar field, e.g. MONTH
      Returns:
        the value for the given field, e.g. FEBRUARY
      See Also:
        Calendar
      Since:
        1.5.5

    - #### public static List<Integer> getAt(Date self, Collection fields)

      Support the subscript operator for a Date with a collection of indices.

      Parameters:
        `self` - a Date
        `fields` - a collection of Calendar fields, e.g. [YEAR, MONTH]
      Returns:
        the value for the given field, e.g. [2022, FEBRUARY]
      See Also:
        Calendar
      Since:
        4.0.5

    - #### public static int getAt(Calendar self, int field)

      Support the subscript operator for a Calendar.

      Parameters:
        `self` - a Calendar
        `field` - a Calendar field, e.g. MONTH
      Returns:
        the value for the given field, e.g. FEBRUARY
      See Also:
        Calendar
      Since:
        1.7.3

    - #### public static List<Integer> getAt(Calendar self, Collection fields)

      Support the subscript operator for a Calendar with a collection of indices.

      Parameters:
        `self` - a Calendar
        `fields` - a collection of Calendar fields, e.g. [YEAR, MONTH]
      Returns:
        the value for the given field, e.g. [2022, FEBRUARY]
      See Also:
        Calendar
      Since:
        4.0.5

    - #### public static String getDateString(Date self)

      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).

      Parameters:
        `self` - a Date
      Returns:
        a string representation of this date
      See Also:
        DateFormat.getDateInstance
        DateFormat.SHORT
      Since:
        1.5.7

    - #### public static String getDateTimeString(Date self)

      Return a string representation of the date and 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).

      Parameters:
        `self` - a Date
      Returns:
        a string representation of this date and time
      See Also:
        DateFormat.getDateTimeInstance
      Since:
        1.5.7

    - #### public static String getTimeString(Date self)

      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).

      Parameters:
        `self` - a Date
      Returns:
        a string representing the time portion of this date
      See Also:
        DateFormat.getTimeInstance
        DateFormat.MEDIUM
      Since:
        1.5.7

    - #### public static Date minus(Date self, int days)

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

      Parameters:
        `self` - a Date
        `days` - the number of days to subtract
      Returns:
        the new date
      Since:
        1.0

    - #### public static Date minus(Date self, int days)

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

      Parameters:
        `self` - a java.sql.Date
        `days` - the number of days to subtract
      Returns:
        the new date
      Since:
        1.0

    - #### public static Timestamp minus(Timestamp self, int days)

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

      Parameters:
        `self` - a Timestamp
        `days` - the number of days to subtract
      Returns:
        the new Timestamp

    - #### public static int minus(Calendar self, Calendar 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:
        `self` - a Calendar
        `then` - another Calendar
      Returns:
        number of days
      Since:
        1.6.0

    - #### public static int minus(Date self, 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:
        `self` - a Date
        `then` - another Date
      Returns:
        number of days
      Since:
        1.6.0

    - #### public static Date next(Date self)

      Increment a Date by one day.

      Parameters:
        `self` - a Date
      Returns:
        the next days date
      Since:
        1.0

    - #### public static Calendar next(Calendar self)

      Increment a Calendar by one day.

      Parameters:
        `self` - a Calendar
      Returns:
        a new Calendar set to the next day
      Since:
        1.8.7

    - #### public static Date next(Date self)

      Increment a java.sql.Date by one day.

      Parameters:
        `self` - a java.sql.Date
      Returns:
        the next days date
      Since:
        1.0

    - #### public static Date plus(Date self, int days)

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

      Parameters:
        `self` - a Date
        `days` - the number of days to increase
      Returns:
        the new date
      Since:
        1.0

    - #### public static Date plus(Date self, int days)

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

      Parameters:
        `self` - a java.sql.Date
        `days` - the number of days to increase
      Returns:
        the new date
      Since:
        1.0

    - #### public static Timestamp plus(Timestamp self, int days)

      Add number of days to this Timestamp and returns the new Timestamp object.

      Parameters:
        `self` - a Timestamp
        `days` - the number of days to increase
      Returns:
        the new Timestamp

    - #### public static Calendar previous(Calendar self)

      Decrement a Calendar by one day.

      Parameters:
        `self` - a Calendar
      Returns:
        a new Calendar set to the previous day
      Since:
        1.8.7

    - #### public static Date previous(Date self)

      Decrement a Date by one day.

      Parameters:
        `self` - a Date
      Returns:
        the previous days date
      Since:
        1.0

    - #### public static Date previous(Date self)

      Decrement a java.sql.Date by one day.

      Parameters:
        `self` - a java.sql.Date
      Returns:
        the previous days date
      Since:
        1.0

    - #### public static void putAt(Calendar self, int field, int value)

      Support the subscript operator for mutating a Calendar. Example usage:

           import static java.util.Calendar.*
           def cal = Calendar.instance
           cal[DAY_OF_WEEK] = MONDAY
           cal[MONTH] = MARCH
           println cal.time // A Monday in March

      Parameters:
        `self` - A Calendar
        `field` - A Calendar field, e.g. MONTH
        `value` - The value for the given field, e.g. FEBRUARY
      See Also:
        Calendar.set
      Since:
        1.7.3

    - #### public static void putAt(Date self, int field, int value)

      Support the subscript operator for mutating a Date.

      Parameters:
        `self` - A Date
        `field` - A Calendar field, e.g. MONTH
        `value` - The value for the given field, e.g. FEBRUARY
      See Also:
        putAt(java.util.Calendar, int, int)
        Calendar.set
      Since:
        1.7.3

    - #### public static void set(Calendar self, Map<Object, Integer> updates)

      Support mutating a Calendar with a Map.

      The map values are the normal values provided as the second parameter to `java.util.Calendar#set(int, int)`. The keys can either be the normal fields values provided as the first parameter to that method or one of the following Strings:

      Calendar index values
      year | Calendar.YEAR
      month | Calendar.MONTH
      date | Calendar.DATE
      dayOfMonth | Calendar.DATE
      hourOfDay | Calendar.HOUR_OF_DAY
      minute | Calendar.MINUTE
      second | Calendar.SECOND

      Example usage:

           import static java.util.Calendar.*
           def cal = Calendar.instance
           def m = [:]
           m[YEAR] = 2010
           m[MONTH] = DECEMBER
           m[DATE] = 25
           cal.set(m)
           println cal.time // Christmas 2010

           cal.set(year:2011, month:DECEMBER, date:25)
           println cal.time // Christmas 2010

      Parameters:
        `self` - A Calendar
        `updates` - A Map of Calendar keys and values
      See Also:
        Calendar.set
        Calendar.set
      Since:
        1.7.3

    - #### public static void set(Date self, Map<Object, Integer> updates)

      Support mutating a Date with a Map.

      The map values are the normal values provided as the second parameter to `java.util.Calendar#set(int, int)`. The keys can either be the normal fields values provided as the first parameter to that method or one of the following Strings:

      Calendar index values
      year | Calendar.YEAR
      month | Calendar.MONTH
      date | Calendar.DATE
      dayOfMonth | Calendar.DATE
      hourOfDay | Calendar.HOUR_OF_DAY
      minute | Calendar.MINUTE
      second | Calendar.SECOND

      Example usage:

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

      Parameters:
        `self` - A Date
        `updates` - A Map of Calendar keys and values
      See Also:
        Calendar.set
        set(java.util.Calendar, java.util.Map)
      Since:
        1.7.3

    - #### public static Calendar toCalendar(Date self)

      Convert a Date to a Calendar.

      Parameters:
        `self` - a Date
      Returns:
        a Calendar corresponding to the given Date
      Since:
        1.7.6

    - #### public static Calendar updated(Calendar self, Map<Object, Integer> updates)

      Legacy alias for copyWith. Will be deprecated and removed in future versions of Groovy.

      See Also:
        copyWith(java.util.Calendar, java.util.Map)
      Since:
        1.7.3

    - #### public static Date updated(Date self, Map<Object, Integer> updates)

      Legacy alias for copyWith. Will be deprecated and removed in future versions of Groovy.

      See Also:
        copyWith(java.util.Date, java.util.Map)
      Since:
        1.7.3

    - #### public static void upto(Date self, Date to, Closure closure)

      Iterates from this date up to the given date, inclusive, incrementing by one day each time.

      Parameters:
        `self` - a Date
        `to` - another Date to go up to
        `closure` - the closure to call
      Since:
        2.2

    - #### public static void upto(Calendar self, Calendar to, Closure closure)

      Iterates from the date represented by this calendar up to the date represented by the given calendar, inclusive, incrementing by one day each time.

      Parameters:
        `self` - a Calendar
        `to` - another Calendar to go up to
        `closure` - the closure to call
      Since:
        2.2