Changes for DateTime::Set

0.14  2003-11-02
- duration() should not set $@ for sets with infinity duration.
  Reported by Dan Kubb.

0.13
0.1205  2003-10-16
- requires Set::Infinite 0.54 (it is the "published" version of 0.5307)
- DateTime::Set add_duration mutates the set. This is more compatible
  with the way the DateTime.pm API works.
- new DateTime::SpanSet methods:
  as_list( $span_spec ), next( $dt|$span ), previous( $dt|$span )

0.1204  2003-10-10
- DateTime::SpanSet and DateTime::Span inherit DateTime::Set $VERSION
- Trying to subtract infinity from a datetime is not fatal in duration()
  Bug report by Dan Kubb.
- new method 'iterate'
- requires Set::Infinite 0.5307 (pass new backtracking tests)
- added more tests for add_duration, subtract_duration
- added set( locale => .. ) to DateTime::Set

0.1203  2003-09-26
- Added docs to Set::Infinite::_recurrence;
  split into a separate file such that it doesn't mix the pods
- refactored union / intersection
- _is_recurrence test prevents error when programming subroutine methods

0.1202  2003-09-24
- fixed set_time_zone and add_duration: 
  was not clearing 'next' upon return, when arg was a recurrence.

0.1201  2003-09-24
- optimized contains() and intersects() when arg is a datetime
- recurrence constructor always adds '->clone' to recurrence function 
- refactored _recurrence method;
  first/last of recurrences are calculated 'on demand'
- requires Set::Infinite 0.5305

0.12   2003-09-22
- implement previous() in DT::SpanSet.pm
- Fixed: set_time_zone would mutate a clone.

0.11   2003-09-19
- Fixed callback return value on set_time_zone. 
  This caused the start date to be equal to the end date.
  Bug found by Dan Kubb.

0.10   2003-09-02
- DateTime::Span->duration now uses the new subtract_datetime_absolute
method, which means that the duration is always given in seconds.

- supports _huge_ recurrence sets (not infinite) with "virtual" elements.
  these sets have 'undef' count.
  Experimental - mostly untested !
  this adds support for sets like 'all seconds in 2003'

- faster recurrence intersection
- count returns 'undef' for infinite sets.

0.09    2003-08-18
- added DT::Set count() 
- fixed DT::SpanSet duration()
- methods that accepted a DT object, now accept a list of DT objects.
  Suggested by Ben Bennet, I think.
- added _callback_next - "previous-only recurrences"

- optimizes intersection of recurrence with span

- internal 'S::I' recurrence class

- small fix in DT::Set clone()
- DateTime::Set uses DateTime infinity constants; 
  max and min now return DateTime::Infinite::Future/Past objects.

- DateTime::Span uses DateTime infinity constants; 
  max and min now return DateTime::Infinite::Future/Past objects.
  Docs update to explain 'max()' value when a span is built using 'before'.

- added method set_time_zone()
- clone() is documented

0.08     2003-05-30
- recurrence set intersection uses 'current'
- fixed a number of methods in DateTime::Span, including intersection,
intersects, contains, union, and complement, all of which called the
non-existent DateTime::Set->new method.  Dave Rolsky.

0.07     2003-05-23
- some tweaking on intersection, union, and in the recurrence generator.
- more tests

0.06     2003-05-14
- added 'use warnings' in some tests, added DateTime 0.12 prereq.

0.04     2003-05-12
- change "closest" code to avoid duration comparison

0.03     2003-04-27
- fixes in Set.pm as_list, span.
- iterator accepts 'span' parameters.  Ben Bennett
- remove deprecated DateTime::Set->new and DateTime::SpanSet->new.  Dave Rolsky
- requires Set::Infinite 0.49

0.02     2003-04-20
- removed some calls to 'new'
- added many methods from DT::Event::Recurrence
- add 'span' parameter to as_list
- from_recurrence now accepts next + previous

0.01     2003-04-19

- first "official" release.
- implemented DateTime::SpanSet->from_sets and
  DateTime::SpanSet->from_set_and_duration
- Many doc tweaks.  Dave Rolsky
- DateTime::Span->duration and DateTime::SpanSet->duration now return
infinity instead of undef for infinite spans.  Dave Rolsky
- Added DateTime::SpanSet->empty_set.  Dave Rolsky

0.00_20  2003-04-10

- Docs for DateTime::SpanSet API 
  (not implemented)
- DateTime::Span API: 
  from_datetime_and_duration, from_datetimes


0.00_18  2003-03-25

- changes docs, changed API
  from_recurrence, from_datetimes, new()
- as_list
- previous() method (quite untested)
- small API changes
- revised docs, from Dave Rolsky
- small bugfix in creating open spans
- added DateTime::Span and DateTime::SpanSet
- put "..." to mark where we need more docs
- DateTime::Set and DateTime::Span API look ok.


0.00_13  2003-03-19

- added tests for set operations with recurrences/add
- iterator passes all tests
- the API is complete, as described in SYNOPSIS
- small fix in add() syntax; accepts a duration=> parameter
- iterator, next


0.00_10  2003-03-14

- union, intersection
- experimental code to generate recurrence from a simple callback


0.00_07  2003-02-28

- added experimental method create_recurrence()
- added experimental method add_duration()
- improved SYNOPSIS
- added 'immutability' tests
- new() will not try to clone non-DateTime parameters (such as the
  Infinity value)
- The program will die with an error message, 
  if one tries to use offset() or quantize() methods
  These methods might come back in a later version.
- new() clones its parameters.
  This means the parameters don't have to be immutable
- new() will give an error message if we try to use a scalar parameter
  instead of a DateTime
- Uses Set::Infinite as base class, instead of Date::Set::Timezone
  This means some methods just disappeared, like event() and exclude().
  RFC2445 support might come back in a later revision.
- Removed experimental Autoload code
- Added 'Changes' and 'README'
- moved POD to end of source file.