Package org.apache.groovy.dateutil.extensions

# Class DateUtilExtensions

java.lang.Object
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.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `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.
  `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.
  `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.
  `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.
  `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.
  `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.
  `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.
  `static String`
  `format(Calendar self, String pattern)`
  Shortcut for `SimpleDateFormat` to output a String representation of this calendar instance.
  `static String`
  `format(Date self, String format)`
  Create a String representation of this date according to the given format pattern.
  `static String`
  `format(Date self, String format, TimeZone tz)`
  Create a String representation of this date according to the given format pattern and timezone.
  `static int`
  `getAt(Calendar self, int field)`
  Support the subscript operator for a Calendar.
  `static List<Integer>`
  `getAt(Calendar self, Collection fields)`
  Support the subscript operator for a Calendar with a collection of indices.
  `static int`
  `getAt(Date self, int field)`
  Support the subscript operator for a Date.
  `static List<Integer>`
  `getAt(Date self, Collection fields)`
  Support the subscript operator for a Date with a collection of indices.
  `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.
  `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`.
  `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.
  `static Date`
  `minus(Date self, int days)`
  Subtract a number of days from this date and returns the new date.
  `static Timestamp`
  `minus(Timestamp self, int days)`
  Subtract a number of days from this Timestamp and returns the new Timestamp object.
  `static int`
  `minus(Calendar self, Calendar then)`
  Subtract another date from this one and return the number of days of the difference.
  `static Date`
  `minus(Date self, int days)`
  Subtract a number of days from this date and returns the new date.
  `static int`
  `minus(Date self, Date then)`
  Subtract another Date from this one and return the number of days of the difference.
  `static Date`
  `next(Date self)`
  Increment a java.sql.Date by one day.
  `static Calendar`
  `next(Calendar self)`
  Increment a Calendar by one day.
  `static Date`
  `next(Date self)`
  Increment a Date by one day.
  `static Date`
  `plus(Date self, int days)`
  Add a number of days to this date and returns the new date.
  `static Timestamp`
  `plus(Timestamp self, int days)`
  Add number of days to this Timestamp and returns the new Timestamp object.
  `static Date`
  `plus(Date self, int days)`
  Add a number of days to this date and returns the new date.
  `static Date`
  `previous(Date self)`
  Decrement a java.sql.Date by one day.
  `static Calendar`
  `previous(Calendar self)`
  Decrement a Calendar by one day.
  `static Date`
  `previous(Date self)`
  Decrement a Date by one day.
  `static void`
  `putAt(Calendar self, int field, int value)`
  Support the subscript operator for mutating a Calendar.
  `static void`
  `putAt(Date self, int field, int value)`
  Support the subscript operator for mutating a Date.
  `static void`
  `set(Calendar self, Map<Object,Integer> updates)`
  Support mutating a Calendar with a Map.
  `static void`
  `set(Date self, Map<Object,Integer> updates)`
  Support mutating a Date with a Map.
  `static Calendar`
  `toCalendar(Date self)`
  Convert a Date to a Calendar.
  `static Calendar`
  `updated(Calendar self, Map<Object,Integer> updates)`
  Legacy alias for copyWith.
  `static Date`
  `updated(Date self, Map<Object,Integer> updates)`
  Legacy alias for copyWith.
  `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.
  `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.

  ### Methods inherited from class java.lang.Object

  `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- ## Method Details

  - ### getAt

    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
    Since:
      1.5.5
    See Also:
      - `Calendar`

  - ### getAt

    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]
    Since:
      4.0.5
    See Also:
      - `Calendar`

  - ### toCalendar

    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

  - ### getAt

    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
    Since:
      1.7.3
    See Also:
      - `Calendar`

  - ### getAt

    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]
    Since:
      4.0.5
    See Also:
      - `Calendar`

  - ### putAt

    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
    Since:
      1.7.3
    See Also:
      - `Calendar.set(int, int)`

  - ### putAt

    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
    Since:
      1.7.3
    See Also:
      - `putAt(java.util.Calendar, int, int)`
      - `Calendar.set(int, int)`

  - ### set

    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
    Since:
      1.7.3
    See Also:
      - `Calendar.set(int, int)`
      - `Calendar.set(int, int, int, int, int, int)`

  - ### updated

    public static Calendar updated(Calendar self, Map<Object,Integer> updates)
    Legacy alias for copyWith. Will be deprecated and removed in future versions of Groovy.
    Since:
      1.7.3
    See Also:
      - `copyWith(java.util.Calendar, java.util.Map)`

  - ### copyWith

    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
    Since:
      2.2.0
    See Also:
      - `Calendar.set(int, int)`
      - `Calendar.set(int, int, int, int, int, int)`
      - `set(java.util.Calendar, java.util.Map)`

  - ### set

    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
    Since:
      1.7.3
    See Also:
      - `Calendar.set(int, int)`
      - `set(java.util.Calendar, java.util.Map)`

  - ### updated

    public static Date updated(Date self, Map<Object,Integer> updates)
    Legacy alias for copyWith. Will be deprecated and removed in future versions of Groovy.
    Since:
      1.7.3
    See Also:
      - `copyWith(java.util.Date, java.util.Map)`

  - ### copyWith

    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
    Since:
      2.2.0
    See Also:
      - `Calendar.set(int, int)`
      - `set(java.util.Date, java.util.Map)`
      - `copyWith(java.util.Calendar, java.util.Map)`

  - ### next

    public static Date next(Date self)
    Increment a Date by one day.
    Parameters:
      `self` - a Date
    Returns:
      the next days date
    Since:
      1.0

  - ### next

    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

  - ### previous

    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

  - ### next

    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

  - ### previous

    public static Date previous(Date self)
    Decrement a Date by one day.
    Parameters:
      `self` - a Date
    Returns:
      the previous days date
    Since:
      1.0

  - ### previous

    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

  - ### plus

    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

  - ### plus

    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

  - ### plus

    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

  - ### minus

    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

  - ### minus

    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

  - ### minus

    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

  - ### minus

    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

  - ### minus

    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

  - ### format

    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.
    Since:
      1.5.7
    See Also:
      - `SimpleDateFormat`

  - ### format

    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.
    Since:
      1.8.3
    See Also:
      - `SimpleDateFormat`

  - ### getDateString

    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
    Since:
      1.5.7
    See Also:
      - `DateFormat.getDateInstance(int)`
      - `DateFormat.SHORT`

  - ### getTimeString

    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
    Since:
      1.5.7
    See Also:
      - `DateFormat.getTimeInstance(int)`
      - `DateFormat.MEDIUM`

  - ### getDateTimeString

    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
    Since:
      1.5.7
    See Also:
      - `DateFormat.getDateTimeInstance(int, int)`

  - ### clearTime

    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

  - ### clearTime

    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

  - ### clearTime

    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

  - ### format

    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(int, java.util.Locale)` 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.
    Since:
      1.6.0
    See Also:
      - `DateFormat.setTimeZone(java.util.TimeZone)`
      - `DateFormat.format(java.util.Date)`
      - `format(java.util.Date, String)`

  - ### upto

    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

  - ### upto

    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

  - ### downto

    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

  - ### downto

    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